postgresql-10-citus 7.0.3.PGDG-1 / usr / share / postgresql / 10 / extension / citus--7.0-8.sql

/* citus.sql */

-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION citus" to load this file. \quit

CREATE SCHEMA citus;

-- Ensure CREATE EXTENSION is not run against an old citus data
-- directory, we're not compatible (due to the builtin functions/tables)
DO $$
BEGIN
   IF EXISTS(SELECT * FROM pg_proc WHERE proname = 'worker_apply_shard_ddl_command') THEN
      RAISE 'cannot install citus extension in Citus 4 data directory';
   END IF;
END;
$$;

/*****************************************************************************
 * Citus data types
 *****************************************************************************/
CREATE TYPE citus.distribution_type AS ENUM (
   'hash',
   'range',
   'append'
);


/*****************************************************************************
 * Citus tables & corresponding indexes
 *****************************************************************************/
CREATE TABLE citus.pg_dist_partition(
    logicalrelid Oid NOT NULL,    /* type changed to regclass as of version 6.0-1 */
    partmethod "char" NOT NULL,
    partkey text NOT NULL
);
/* SELECT granted to PUBLIC in upgrade script */
CREATE UNIQUE INDEX pg_dist_partition_logical_relid_index
ON citus.pg_dist_partition using btree(logicalrelid);
ALTER TABLE citus.pg_dist_partition SET SCHEMA pg_catalog;

CREATE TABLE citus.pg_dist_shard(
    logicalrelid oid NOT NULL,    /* type changed to regclass as of version 6.0-1 */
    shardid int8 NOT NULL,
    shardstorage "char" NOT NULL,
    shardalias text,
    shardminvalue text,
    shardmaxvalue text
);
/* SELECT granted to PUBLIC in upgrade script */
CREATE UNIQUE INDEX pg_dist_shard_shardid_index
ON citus.pg_dist_shard using btree(shardid);
CREATE INDEX pg_dist_shard_logical_relid_index
ON citus.pg_dist_shard using btree(logicalrelid);
ALTER TABLE citus.pg_dist_shard SET SCHEMA pg_catalog;

CREATE TABLE citus.pg_dist_shard_placement(
    shardid int8 NOT NULL,
    shardstate int4 NOT NULL,
    shardlength int8 NOT NULL,
    nodename text NOT NULL,
    nodeport int8 NOT NULL
) WITH oids;
/* SELECT granted to PUBLIC in upgrade script */
CREATE UNIQUE INDEX pg_dist_shard_placement_oid_index
ON citus.pg_dist_shard_placement using btree(oid);
CREATE INDEX pg_dist_shard_placement_shardid_index
ON citus.pg_dist_shard_placement using btree(shardid);
CREATE INDEX pg_dist_shard_placement_nodeid_index
ON citus.pg_dist_shard_placement using btree(nodename, nodeport);
ALTER TABLE citus.pg_dist_shard_placement SET SCHEMA pg_catalog;


/*****************************************************************************
 * Citus sequences
 *****************************************************************************/

/*
 * Unternal sequence to generate 64-bit shard ids. These identifiers are then
 * used to identify shards in the distributed database.
 */
CREATE SEQUENCE citus.pg_dist_shardid_seq
    MINVALUE 102008
    NO CYCLE;
ALTER SEQUENCE  citus.pg_dist_shardid_seq SET SCHEMA pg_catalog;

/*
 * internal sequence to generate 32-bit jobIds. These identifiers are then
 * used to identify jobs in the distributed database; and they wrap at 32-bits
 * to allow for slave nodes to independently execute their distributed jobs.
 */
CREATE SEQUENCE citus.pg_dist_jobid_seq
    MINVALUE 2 /* first jobId reserved for clean up jobs */
    MAXVALUE 4294967296;
ALTER SEQUENCE  citus.pg_dist_jobid_seq SET SCHEMA pg_catalog;


/*****************************************************************************
 * Citus functions
 *****************************************************************************/

/* For backward compatibility and ease of use create functions et al. in pg_catalog */
SET search_path = 'pg_catalog';

/* master_* functions */

CREATE FUNCTION master_get_table_metadata(relation_name text, OUT logical_relid oid,
                                          OUT part_storage_type "char",
                                          OUT part_method "char", OUT part_key text,
                                          OUT part_replica_count integer,
                                          OUT part_max_size bigint,
                                          OUT part_placement_policy integer)
    RETURNS record
    LANGUAGE C STABLE STRICT
    AS 'MODULE_PATHNAME', $$master_get_table_metadata$$;
COMMENT ON FUNCTION master_get_table_metadata(relation_name text)
    IS 'fetch metadata values for the table';

CREATE FUNCTION master_get_table_ddl_events(text)
    RETURNS SETOF text
    LANGUAGE C STRICT ROWS 100
    AS 'MODULE_PATHNAME', $$master_get_table_ddl_events$$;
COMMENT ON FUNCTION master_get_table_ddl_events(text)
    IS 'fetch set of ddl statements for the table';

CREATE FUNCTION master_get_new_shardid()
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_get_new_shardid$$;
COMMENT ON FUNCTION master_get_new_shardid()
    IS 'fetch unique shardId';

CREATE FUNCTION master_create_empty_shard(text)
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_create_empty_shard$$;
COMMENT ON FUNCTION master_create_empty_shard(text)
    IS 'create an empty shard and shard placements for the table';

CREATE FUNCTION master_append_table_to_shard(bigint, text, text, integer)
    RETURNS real
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_append_table_to_shard$$;
COMMENT ON FUNCTION master_append_table_to_shard(bigint, text, text, integer)
    IS 'append given table to all shard placements and update metadata';

CREATE FUNCTION master_drop_all_shards(logicalrelid regclass,
                                       schema_name text,
                                       table_name text)
    RETURNS integer
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_drop_all_shards$$;
COMMENT ON FUNCTION master_drop_all_shards(regclass, text, text)
    IS 'drop all shards in a relation and update metadata';

CREATE FUNCTION master_apply_delete_command(text)
    RETURNS integer
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_apply_delete_command$$;
COMMENT ON FUNCTION master_apply_delete_command(text)
    IS 'drop shards matching delete criteria and update metadata';

CREATE FUNCTION master_get_active_worker_nodes(OUT node_name text, OUT node_port bigint)
    RETURNS SETOF record
    LANGUAGE C STRICT ROWS 100
    AS 'MODULE_PATHNAME', $$master_get_active_worker_nodes$$;
COMMENT ON FUNCTION master_get_active_worker_nodes()
    IS 'fetch set of active worker nodes';

CREATE FUNCTION master_create_distributed_table(table_name regclass,
                                                distribution_column text,
                                                distribution_method citus.distribution_type)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_create_distributed_table$$;
COMMENT ON FUNCTION master_create_distributed_table(table_name regclass,
                                                    distribution_column text,
                                                    distribution_method citus.distribution_type)
    IS 'define the table distribution functions';

-- define shard creation function for hash-partitioned tables
CREATE FUNCTION master_create_worker_shards(table_name text, shard_count integer,
                                            replication_factor integer DEFAULT 2)
RETURNS void
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;

/* task_tracker_* functions */

CREATE FUNCTION task_tracker_assign_task(bigint, integer, text)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$task_tracker_assign_task$$;
COMMENT ON FUNCTION task_tracker_assign_task(bigint, integer, text)
    IS 'assign a task to execute';

CREATE FUNCTION task_tracker_task_status(bigint, integer)
    RETURNS integer
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$task_tracker_task_status$$;
COMMENT ON FUNCTION task_tracker_task_status(bigint, integer)
    IS 'check an assigned task''s execution status';

CREATE FUNCTION task_tracker_cleanup_job(bigint)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$task_tracker_cleanup_job$$;
COMMENT ON FUNCTION task_tracker_cleanup_job(bigint)
    IS 'clean up all tasks associated with a job';


/* worker_* functions */

CREATE FUNCTION worker_fetch_partition_file(bigint, integer, integer, integer, text,
                                            integer)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_partition_file$$;
COMMENT ON FUNCTION worker_fetch_partition_file(bigint, integer, integer, integer, text,
                                                integer)
    IS 'fetch partition file from remote node';

CREATE FUNCTION worker_fetch_query_results_file(bigint, integer, integer, text, integer)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_query_results_file$$;
COMMENT ON FUNCTION worker_fetch_query_results_file(bigint, integer, integer, text,
                                                    integer)
    IS 'fetch query results file from remote node';

CREATE FUNCTION worker_fetch_foreign_file(text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_foreign_file$$;
COMMENT ON FUNCTION worker_fetch_foreign_file(text, bigint, text[], integer[])
    IS 'fetch foreign file from remote node and apply file';

CREATE FUNCTION worker_fetch_regular_table(text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_regular_table$$;
COMMENT ON FUNCTION worker_fetch_regular_table(text, bigint, text[], integer[])
    IS 'fetch PostgreSQL table from remote node';

CREATE FUNCTION worker_range_partition_table(bigint, integer, text, text, oid, anyarray)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_range_partition_table$$;
COMMENT ON FUNCTION worker_range_partition_table(bigint, integer, text, text, oid,
                                                 anyarray)
    IS 'range partition query results';

CREATE FUNCTION worker_hash_partition_table(bigint, integer, text, text, oid, integer)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_hash_partition_table$$;
COMMENT ON FUNCTION worker_hash_partition_table(bigint, integer, text, text, oid,
                                                integer)
    IS 'hash partition query results';

CREATE FUNCTION worker_merge_files_into_table(bigint, integer, text[], text[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_merge_files_into_table$$;
COMMENT ON FUNCTION worker_merge_files_into_table(bigint, integer, text[], text[])
    IS 'merge files into a table';

CREATE FUNCTION worker_merge_files_and_run_query(bigint, integer, text, text)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_merge_files_and_run_query$$;
COMMENT ON FUNCTION worker_merge_files_and_run_query(bigint, integer, text, text)
    IS 'merge files and run a reduce query on merged files';

CREATE FUNCTION worker_cleanup_job_schema_cache()
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_cleanup_job_schema_cache$$;
COMMENT ON FUNCTION worker_cleanup_job_schema_cache()
    IS 'cleanup all job schemas in current database';

CREATE FUNCTION worker_foreign_file_path(text)
    RETURNS text
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_foreign_file_path$$;
COMMENT ON FUNCTION worker_foreign_file_path(text)
    IS 'get a foreign table''s local file path';

CREATE FUNCTION worker_find_block_local_path(bigint, text[])
    RETURNS text
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_find_block_local_path$$;
COMMENT ON FUNCTION worker_find_block_local_path(bigint, text[])
    IS 'find an HDFS block''s local file path';

CREATE FUNCTION worker_apply_shard_ddl_command(bigint, text)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_apply_shard_ddl_command$$;
COMMENT ON FUNCTION worker_apply_shard_ddl_command(bigint, text)
    IS 'extend ddl command with shardId and apply on database';

CREATE FUNCTION worker_append_table_to_shard(text, text, text, integer)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_append_table_to_shard$$;
COMMENT ON FUNCTION worker_append_table_to_shard(text, text, text, integer)
    IS 'append a regular table''s contents to the shard';


/* trigger functions */

CREATE OR REPLACE FUNCTION citus_drop_trigger()
    RETURNS event_trigger
    LANGUAGE plpgsql
    SET search_path = pg_catalog
    /* declared as SECURITY DEFINER in upgrade script */
    AS $cdbdt$
DECLARE v_obj record;
BEGIN
    FOR v_obj IN SELECT * FROM pg_event_trigger_dropped_objects() LOOP
        IF v_obj.object_type NOT IN ('table', 'foreign table') THEN
           CONTINUE;
        END IF;

        -- nothing to do if not a distributed table
        IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE logicalrelid = v_obj.objid) THEN
            CONTINUE;
        END IF;

        -- ensure all shards are dropped
        PERFORM master_drop_all_shards(v_obj.objid, v_obj.schema_name, v_obj.object_name);

        -- delete partition entry
        DELETE FROM pg_dist_partition WHERE logicalrelid = v_obj.objid;

    END LOOP;
END;
$cdbdt$;
COMMENT ON FUNCTION citus_drop_trigger()
    IS 'perform checks and actions at the end of DROP actions';

CREATE FUNCTION master_dist_partition_cache_invalidate()
    RETURNS trigger
    LANGUAGE C
    AS 'MODULE_PATHNAME', $$master_dist_partition_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_partition_cache_invalidate()
    IS 'register relcache invalidation for changed rows';

CREATE FUNCTION master_dist_shard_cache_invalidate()
    RETURNS trigger
    LANGUAGE C
    AS 'MODULE_PATHNAME', $$master_dist_shard_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_shard_cache_invalidate()
    IS 'register relcache invalidation for changed rows';


/* internal functions, not user accessible */

CREATE FUNCTION citus_extradata_container(INTERNAL)
    RETURNS void
    LANGUAGE C
    AS 'MODULE_PATHNAME', $$citus_extradata_container$$;
COMMENT ON FUNCTION pg_catalog.citus_extradata_container(INTERNAL)
    IS 'placeholder function to store additional data in postgres node trees';


/*****************************************************************************
 * Citus triggers
 *****************************************************************************/

CREATE EVENT TRIGGER citus_cascade_to_partition
    ON SQL_DROP
    EXECUTE PROCEDURE citus_drop_trigger();

CREATE TRIGGER dist_partition_cache_invalidate
    AFTER INSERT OR UPDATE OR DELETE
    ON pg_catalog.pg_dist_partition
    FOR EACH ROW EXECUTE PROCEDURE master_dist_partition_cache_invalidate();

CREATE TRIGGER dist_shard_cache_invalidate
    AFTER INSERT OR UPDATE OR DELETE
    ON pg_catalog.pg_dist_shard
    FOR EACH ROW EXECUTE PROCEDURE master_dist_shard_cache_invalidate();


/*****************************************************************************
 * Citus aggregates
 *****************************************************************************/
CREATE AGGREGATE array_cat_agg(anyarray) (SFUNC = array_cat, STYPE = anyarray);
COMMENT ON AGGREGATE array_cat_agg(anyarray)
    IS 'concatenate input arrays into a single array';


/*
 * Creates a temporary table exactly like the specified target table along with
 * a trigger to redirect any INSERTed rows from the proxy to the underlying
 * table. Users may optionally provide a sequence which will be incremented
 * after each row that has been successfully proxied (useful for counting rows
 * processed). Returns the name of the proxy table that was created.
 */
CREATE FUNCTION create_insert_proxy_for_table(target_table regclass,
                                              sequence regclass DEFAULT NULL)
RETURNS text
AS $create_insert_proxy_for_table$
    DECLARE
        temp_table_name text;
        attr_names text[];
        attr_list text;
        param_list text;
        using_list text;
        insert_command text;
        -- templates to create dynamic functions, tables, and triggers
        func_tmpl CONSTANT text :=    $$CREATE FUNCTION pg_temp.copy_to_insert()
                                        RETURNS trigger
                                        AS $copy_to_insert$
                                        BEGIN
                                            EXECUTE %L USING %s;
                                            PERFORM nextval(%L);
                                            RETURN NULL;
                                        END;
                                        $copy_to_insert$ LANGUAGE plpgsql;$$;
        table_tmpl CONSTANT text :=   $$CREATE TEMPORARY TABLE %I
                                        (LIKE %s INCLUDING DEFAULTS)$$;
        trigger_tmpl CONSTANT text := $$CREATE TRIGGER copy_to_insert
                                        BEFORE INSERT ON %s FOR EACH ROW
                                        EXECUTE PROCEDURE pg_temp.copy_to_insert()$$;
    BEGIN
        -- create name of temporary table using unqualified input table name
        SELECT format('%s_insert_proxy', relname)
        INTO   STRICT temp_table_name
        FROM   pg_class
        WHERE  oid = target_table;

        -- get list of all attributes in table, we'll need shortly
        SELECT array_agg(attname)
        INTO   STRICT attr_names
        FROM   pg_attribute
        WHERE  attrelid = target_table AND
               attnum > 0 AND
               NOT attisdropped;

        -- build fully specified column list and USING clause from attr. names
        SELECT string_agg(quote_ident(attr_name), ','),
               string_agg(format('NEW.%I', attr_name), ',')
        INTO   STRICT attr_list,
                      using_list
        FROM   unnest(attr_names) AS attr_name;

        -- build ($1, $2, $3)-style VALUE list to bind parameters
        SELECT string_agg('$' || param_num, ',')
        INTO   STRICT param_list
        FROM   generate_series(1, array_length(attr_names, 1)) AS param_num;

        -- use the above lists to generate appropriate INSERT command
        insert_command = format('INSERT INTO %s (%s) VALUES (%s)', target_table,
                                attr_list, param_list);

        -- use the command to make one-off trigger targeting specified table
        EXECUTE format(func_tmpl, insert_command, using_list, sequence);

        -- create a temporary table exactly like the target table...
        EXECUTE format(table_tmpl, temp_table_name, target_table);

        -- ... and install the trigger on that temporary table
        EXECUTE format(trigger_tmpl, quote_ident(temp_table_name)::regclass);

        RETURN temp_table_name;
    END;
$create_insert_proxy_for_table$ LANGUAGE plpgsql SET search_path = 'pg_catalog';

COMMENT ON FUNCTION create_insert_proxy_for_table(regclass, regclass)
        IS 'create a proxy table that redirects INSERTed rows to a target table';

-- define shard repair function
CREATE FUNCTION master_copy_shard_placement(shard_id bigint,
                                            source_node_name text,
                                            source_node_port integer,
                                            target_node_name text,
                                            target_node_port integer)
RETURNS void
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;

RESET search_path;
/* citus--5.0--5.0-1.sql */

ALTER FUNCTION pg_catalog.citus_drop_trigger() SECURITY DEFINER;

GRANT SELECT ON pg_catalog.pg_dist_partition TO public;
GRANT SELECT ON pg_catalog.pg_dist_shard TO public;
GRANT SELECT ON pg_catalog.pg_dist_shard_placement TO public;
/* citus--5.0-1--5.0-2.sql */

CREATE FUNCTION master_update_shard_statistics(shard_id bigint)
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_update_shard_statistics$$;
COMMENT ON FUNCTION master_update_shard_statistics(bigint)
    IS 'updates shard statistics and returns the updated shard size';
/* citus--5.0-2--5.1-1.sql */

/* empty, but required to update the extension version */
CREATE FUNCTION pg_catalog.master_modify_multiple_shards(text)
    RETURNS integer
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_modify_multiple_shards$$;
COMMENT ON FUNCTION master_modify_multiple_shards(text)
    IS 'push delete and update queries to shards';DROP FUNCTION IF EXISTS public.master_update_shard_statistics(shard_id bigint);

CREATE OR REPLACE FUNCTION pg_catalog.master_update_shard_statistics(shard_id bigint)
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_update_shard_statistics$$;
COMMENT ON FUNCTION master_update_shard_statistics(bigint)
    IS 'updates shard statistics and returns the updated shard size';
DROP FUNCTION IF EXISTS pg_catalog.worker_apply_shard_ddl_command(bigint, text);

CREATE OR REPLACE FUNCTION pg_catalog.worker_apply_shard_ddl_command(bigint, text, text)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_apply_shard_ddl_command$$;
COMMENT ON FUNCTION worker_apply_shard_ddl_command(bigint, text, text)
    IS 'extend ddl command with shardId and apply on database';
DROP FUNCTION IF EXISTS pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[]);

CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_foreign_file(text, text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_foreign_file$$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_foreign_file(text, text, bigint, text[], integer[])
    IS 'fetch foreign file from remote node and apply file';

DROP FUNCTION IF EXISTS pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[]);

CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_regular_table(text, text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_regular_table$$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_regular_table(text, text, bigint, text[], integer[])
    IS 'fetch PostgreSQL table from remote node';
CREATE OR REPLACE FUNCTION pg_catalog.worker_apply_shard_ddl_command(bigint, text)
    RETURNS void
    LANGUAGE sql
AS $worker_apply_shard_ddl_command$
    SELECT pg_catalog.worker_apply_shard_ddl_command($1, 'public', $2);
$worker_apply_shard_ddl_command$;
COMMENT ON FUNCTION worker_apply_shard_ddl_command(bigint, text)
    IS 'extend ddl command with shardId and apply on database';

CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE sql
AS $worker_fetch_foreign_file$
    SELECT pg_catalog.worker_fetch_foreign_file('public', $1, $2, $3, $4);
$worker_fetch_foreign_file$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[])
    IS 'fetch foreign file from remote node and apply file';

CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE sql
AS $worker_fetch_regular_table$
    SELECT pg_catalog.worker_fetch_regular_table('public', $1, $2, $3, $4);
$worker_fetch_regular_table$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[])
    IS 'fetch PostgreSQL table from remote node';
DROP FUNCTION IF EXISTS pg_catalog.worker_fetch_foreign_file(text, text, bigint, text[], integer[]);

CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_foreign_file$$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_foreign_file(text, bigint, text[], integer[])
    IS 'fetch foreign file from remote node and apply file';

DROP FUNCTION IF EXISTS pg_catalog.worker_fetch_regular_table(text, text, bigint, text[], integer[]);

CREATE OR REPLACE FUNCTION pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_fetch_regular_table$$;
COMMENT ON FUNCTION pg_catalog.worker_fetch_regular_table(text, bigint, text[], integer[])
    IS 'fetch PostgreSQL table from remote node';
CREATE FUNCTION pg_catalog.master_drop_sequences(sequence_names text[],
												 node_name text,
												 node_port bigint)
	RETURNS bool
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$master_drop_sequences$$;
COMMENT ON FUNCTION pg_catalog.master_drop_sequences(text[], text, bigint)
	IS 'drop specified sequences from a node';

REVOKE ALL ON FUNCTION pg_catalog.master_drop_sequences(text[], text, bigint) FROM PUBLIC;

CREATE OR REPLACE FUNCTION pg_catalog.citus_drop_trigger()
	RETURNS event_trigger
	LANGUAGE plpgsql
	SECURITY DEFINER
	SET search_path = pg_catalog
	AS $cdbdt$
DECLARE
	v_obj record;
	sequence_names text[] := '{}';
	node_names text[] := '{}';
	node_ports bigint[] := '{}';
	node_name text;
	node_port bigint;
BEGIN
	-- collect set of dropped sequences to drop on workers later
	SELECT array_agg(object_identity) INTO sequence_names
	FROM pg_event_trigger_dropped_objects()
	WHERE object_type = 'sequence';

	-- Must accumulate set of affected nodes before deleting placements, as
	-- master_drop_all_shards will erase their rows, making it impossible for
	-- us to know where to drop sequences (which must be dropped after shards,
	-- since they have default value expressions which depend on sequences).
	SELECT array_agg(sp.nodename), array_agg(sp.nodeport)
	INTO node_names, node_ports
	FROM pg_event_trigger_dropped_objects() AS dobj,
		 pg_dist_shard AS s,
		 pg_dist_shard_placement AS sp
	WHERE dobj.object_type IN ('table', 'foreign table')
	  AND dobj.objid = s.logicalrelid
	  AND s.shardid = sp.shardid;

	FOR v_obj IN SELECT * FROM pg_event_trigger_dropped_objects() LOOP
		IF v_obj.object_type NOT IN ('table', 'foreign table') THEN
		   CONTINUE;
		END IF;

		-- nothing to do if not a distributed table
		IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE logicalrelid = v_obj.objid) THEN
			CONTINUE;
		END IF;

		-- ensure all shards are dropped
		PERFORM master_drop_all_shards(v_obj.objid, v_obj.schema_name, v_obj.object_name);

		-- delete partition entry
		DELETE FROM pg_dist_partition WHERE logicalrelid = v_obj.objid;
	END LOOP;

	IF cardinality(sequence_names) = 0 THEN
		RETURN;
	END IF;

	FOR node_name, node_port IN
	SELECT DISTINCT name, port
	FROM unnest(node_names, node_ports) AS nodes(name, port)
	LOOP
		PERFORM master_drop_sequences(sequence_names, node_name, node_port);
	END LOOP;
END;
$cdbdt$;
/* citus--5.1-8--5.2-1.sql */

/* empty, but required to update the extension version */
/* citus--5.2-1--5.2-2.sql */

CREATE OR REPLACE FUNCTION pg_catalog.citus_truncate_trigger()
	RETURNS trigger
	LANGUAGE plpgsql
	SET search_path = 'pg_catalog'
	AS $cdbtt$
DECLARE
	partitionType char;
	commandText text;
BEGIN
	SELECT partmethod INTO partitionType
	FROM pg_dist_partition WHERE logicalrelid = TG_RELID;
	IF NOT FOUND THEN
		RETURN NEW;
	END IF;
	
	IF (partitionType = 'a') THEN
		PERFORM master_drop_all_shards(TG_RELID, TG_TABLE_SCHEMA, TG_TABLE_NAME);
	ELSE
		SELECT format('TRUNCATE TABLE %I.%I CASCADE', TG_TABLE_SCHEMA, TG_TABLE_NAME)
		INTO commandText;
		PERFORM master_modify_multiple_shards(commandText);
	END IF;

	RETURN NEW;
END;
$cdbtt$;
/* citus--5.2-2--5.2-3.sql */
CREATE OR REPLACE FUNCTION master_expire_table_cache(table_name regclass)
	RETURNS VOID
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$master_expire_table_cache$$;
/* citus--5.2-3--5.2-4.sql */

ALTER TABLE pg_dist_partition ADD COLUMN colocationid BIGINT DEFAULT 0 NOT NULL;

CREATE INDEX pg_dist_partition_colocationid_index
ON pg_dist_partition using btree(colocationid);

/* citus--5.2-4--6.0-1.sql */

/* change logicalrelid type to regclass to allow implicit casts to text */
ALTER TABLE pg_catalog.pg_dist_partition ALTER COLUMN logicalrelid TYPE regclass;
ALTER TABLE pg_catalog.pg_dist_shard ALTER COLUMN logicalrelid TYPE regclass;
/* citus--6.0-1--6.0-2.sql */

CREATE FUNCTION pg_catalog.shard_name(object_name regclass, shard_id bigint)
    RETURNS text
    LANGUAGE C STABLE
    AS 'MODULE_PATHNAME', $$shard_name$$;
COMMENT ON FUNCTION pg_catalog.shard_name(object_name regclass, shard_id bigint)
    IS 'returns shard-extended version of object name';

/* citus--6.0-2--6.0-3.sql */

ALTER TABLE pg_catalog.pg_dist_partition
ADD COLUMN repmodel "char" DEFAULT 'c' NOT NULL;
SET search_path = 'pg_catalog';

CREATE SEQUENCE citus.pg_dist_groupid_seq
	MINVALUE 1
	MAXVALUE 4294967296;

CREATE SEQUENCE citus.pg_dist_node_nodeid_seq
	MINVALUE 1
	MAXVALUE 4294967296;

ALTER SEQUENCE citus.pg_dist_groupid_seq SET SCHEMA pg_catalog;
ALTER SEQUENCE citus.pg_dist_node_nodeid_seq SET SCHEMA pg_catalog;

/* add pg_dist_node */
CREATE TABLE citus.pg_dist_node(
	nodeid int NOT NULL DEFAULT nextval('pg_dist_groupid_seq') PRIMARY KEY,
	groupid int NOT NULL DEFAULT nextval('pg_dist_node_nodeid_seq'),
	nodename text NOT NULL,
	nodeport int NOT NULL DEFAULT 5432,
	noderack text NOT NULL DEFAULT 'default',
	UNIQUE (nodename, nodeport)
);

ALTER TABLE citus.pg_dist_node SET SCHEMA pg_catalog;

CREATE FUNCTION master_dist_node_cache_invalidate()
	RETURNS trigger
	LANGUAGE C
	AS 'MODULE_PATHNAME', $$master_dist_node_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_node_cache_invalidate()
	IS 'invalidate internal cache of nodes when pg_dist_nodes changes';
CREATE TRIGGER dist_node_cache_invalidate
    AFTER INSERT OR UPDATE OR DELETE
    ON pg_catalog.pg_dist_node
    FOR EACH ROW EXECUTE PROCEDURE master_dist_node_cache_invalidate();

CREATE FUNCTION master_add_node(nodename text,
								nodeport integer)
	RETURNS record
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$master_add_node$$;
COMMENT ON FUNCTION master_add_node(nodename text,
									nodeport integer)
	IS 'add node to the cluster';

CREATE FUNCTION master_remove_node(nodename text, nodeport integer)
	RETURNS void
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$master_remove_node$$;
COMMENT ON FUNCTION master_remove_node(nodename text, nodeport integer)
	IS 'remove node from the cluster';

/* this only needs to run once, now. */
CREATE FUNCTION master_initialize_node_metadata()
    RETURNS BOOL
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_initialize_node_metadata$$;

SELECT master_initialize_node_metadata();

RESET search_path;
/*
 * Replace oid column in pg_dist_shard_placement with a sequence column.
 */
CREATE SEQUENCE citus.pg_dist_shard_placement_placementid_seq
    NO CYCLE;
ALTER SEQUENCE citus.pg_dist_shard_placement_placementid_seq
    SET SCHEMA pg_catalog;
ALTER TABLE pg_catalog.pg_dist_shard_placement
    ADD COLUMN placementid bigint;
-- keep existing oids, and update sequence to match max.
UPDATE pg_catalog.pg_dist_shard_placement SET placementid = oid;
ALTER TABLE pg_catalog.pg_dist_shard_placement
    ALTER COLUMN placementid SET DEFAULT nextval('pg_catalog.pg_dist_shard_placement_placementid_seq'),
    ALTER COLUMN placementid SET NOT NULL,
    SET WITHOUT OIDS;
CREATE UNIQUE INDEX pg_dist_shard_placement_placementid_index
ON pg_catalog.pg_dist_shard_placement using btree(placementid);
SELECT setval('pg_catalog.pg_dist_shard_placement_placementid_seq', max(placementid))
FROM pg_catalog.pg_dist_shard_placement;

CREATE FUNCTION master_get_new_placementid()
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_get_new_placementid$$;
COMMENT ON FUNCTION master_get_new_placementid()
    IS 'fetch unique placementid';

CREATE FUNCTION worker_drop_distributed_table(logicalrelid Oid)
    RETURNS VOID
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_drop_distributed_table$$;
    
COMMENT ON FUNCTION worker_drop_distributed_table(logicalrelid Oid)
    IS 'drop the clustered table and its reference from metadata tables';
    
CREATE FUNCTION column_name_to_column(table_name regclass, column_name text)
    RETURNS text
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$column_name_to_column$$;
COMMENT ON FUNCTION column_name_to_column(table_name regclass, column_name text)
    IS 'convert a column name to its textual Var representation';
/* citus--6.0-6--6.0-7.sql */

CREATE FUNCTION pg_catalog.get_colocated_table_array(regclass)
    RETURNS regclass[]
    AS 'citus'
    LANGUAGE C STRICT;

CREATE OR REPLACE FUNCTION pg_catalog.master_move_shard_placement(shard_id bigint,
													   source_node_name text,
													   source_node_port integer,
													   target_node_name text,
													   target_node_port integer)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_move_shard_placement$$;
COMMENT ON FUNCTION pg_catalog.master_move_shard_placement(shard_id bigint,
													   source_node_name text,
													   source_node_port integer,
													   target_node_name text,
													   target_node_port integer)
    IS 'move shard from remote node';
/*
 * Drop shardalias from pg_dist_shard
 */
ALTER TABLE pg_dist_shard DROP shardalias;
/* citus--6.0-8--6.0-9.sql */

CREATE TABLE citus.pg_dist_local_group(
    groupid int NOT NULL PRIMARY KEY)
;

/* insert the default value for being the coordinator node */
INSERT INTO citus.pg_dist_local_group VALUES (0);

ALTER TABLE citus.pg_dist_local_group SET SCHEMA pg_catalog;
GRANT SELECT ON pg_catalog.pg_dist_local_group TO public;

ALTER TABLE pg_catalog.pg_dist_node ADD COLUMN hasmetadata bool NOT NULL DEFAULT false;
/* citus--6.0-9--6.0-10.sql */

CREATE TABLE citus.pg_dist_transaction (
    groupid int NOT NULL,
    gid text NOT NULL
);

CREATE INDEX pg_dist_transaction_group_index
ON citus.pg_dist_transaction using btree(groupid);

ALTER TABLE citus.pg_dist_transaction SET SCHEMA pg_catalog;
ALTER TABLE pg_catalog.pg_dist_transaction
ADD CONSTRAINT pg_dist_transaction_unique_constraint UNIQUE (groupid, gid);

GRANT SELECT ON pg_catalog.pg_dist_transaction TO public;

CREATE FUNCTION recover_prepared_transactions()
    RETURNS int
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$recover_prepared_transactions$$;

COMMENT ON FUNCTION recover_prepared_transactions()
    IS 'recover prepared transactions started by this node';

/* citus--6.0-10--6.0-11.sql */

SET search_path = 'pg_catalog';

CREATE SEQUENCE citus.pg_dist_colocationid_seq
	MINVALUE 1
	MAXVALUE 4294967296;

ALTER SEQUENCE citus.pg_dist_colocationid_seq SET SCHEMA pg_catalog;

/* add pg_dist_colocation */
CREATE TABLE citus.pg_dist_colocation(
	colocationid int NOT NULL PRIMARY KEY,
	shardcount int NOT NULL,
	replicationfactor int NOT NULL,
	distributioncolumntype oid NOT NULL
);

ALTER TABLE citus.pg_dist_colocation SET SCHEMA pg_catalog;

CREATE INDEX pg_dist_colocation_configuration_index
ON pg_dist_colocation USING btree(shardcount, replicationfactor, distributioncolumntype);

CREATE FUNCTION create_distributed_table(table_name regclass,
										 distribution_column text,
										 distribution_type citus.distribution_type DEFAULT 'hash')
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$create_distributed_table$$;
COMMENT ON FUNCTION create_distributed_table(table_name regclass,
											 distribution_column text,
											 distribution_type citus.distribution_type)
    IS 'creates a distributed table';


CREATE OR REPLACE FUNCTION pg_catalog.citus_drop_trigger()
    RETURNS event_trigger
    LANGUAGE plpgsql
    SECURITY DEFINER
    SET search_path = pg_catalog
    AS $cdbdt$
DECLARE
    v_obj record;
    sequence_names text[] := '{}';
    node_names text[] := '{}';
    node_ports bigint[] := '{}';
    node_name text;
    node_port bigint;
    table_colocation_id integer;
BEGIN
    -- collect set of dropped sequences to drop on workers later
    SELECT array_agg(object_identity) INTO sequence_names
    FROM pg_event_trigger_dropped_objects()
    WHERE object_type = 'sequence';

    -- Must accumulate set of affected nodes before deleting placements, as
    -- master_drop_all_shards will erase their rows, making it impossible for
    -- us to know where to drop sequences (which must be dropped after shards,
    -- since they have default value expressions which depend on sequences).
    SELECT array_agg(sp.nodename), array_agg(sp.nodeport)
    INTO node_names, node_ports
    FROM pg_event_trigger_dropped_objects() AS dobj,
         pg_dist_shard AS s,
         pg_dist_shard_placement AS sp
    WHERE dobj.object_type IN ('table', 'foreign table')
      AND dobj.objid = s.logicalrelid
      AND s.shardid = sp.shardid;

    FOR v_obj IN SELECT * FROM pg_event_trigger_dropped_objects() LOOP
        IF v_obj.object_type NOT IN ('table', 'foreign table') THEN
           CONTINUE;
        END IF;

        -- nothing to do if not a distributed table
        IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE logicalrelid = v_obj.objid) THEN
            CONTINUE;
        END IF;

        -- ensure all shards are dropped
        PERFORM master_drop_all_shards(v_obj.objid, v_obj.schema_name, v_obj.object_name);

        -- get colocation group
        SELECT colocationid INTO table_colocation_id FROM pg_dist_partition WHERE logicalrelid = v_obj.objid;

        -- delete partition entry
        DELETE FROM pg_dist_partition WHERE logicalrelid = v_obj.objid;

        -- drop colocation group if all referencing tables are dropped
        IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE colocationId = table_colocation_id) THEN
            DELETE FROM pg_dist_colocation WHERE colocationId = table_colocation_id;
        END IF;
    END LOOP;

    IF cardinality(sequence_names) = 0 THEN
        RETURN;
    END IF;

    FOR node_name, node_port IN
    SELECT DISTINCT name, port
    FROM unnest(node_names, node_ports) AS nodes(name, port)
    LOOP
        PERFORM master_drop_sequences(sequence_names, node_name, node_port);
    END LOOP;
END;
$cdbdt$;

COMMENT ON FUNCTION citus_drop_trigger()
    IS 'perform checks and actions at the end of DROP actions';

ALTER TABLE pg_dist_partition ALTER COLUMN colocationid TYPE integer;

RESET search_path;
/* citus--6.0-11--6.0-12.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION create_reference_table(table_name regclass)
	RETURNS void
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$create_reference_table$$;
COMMENT ON FUNCTION create_reference_table(table_name regclass)
	IS 'create a distributed reference table';

RESET search_path;
/* citus--6.0-12--6.0-13.sql */

CREATE FUNCTION pg_catalog.worker_apply_inter_shard_ddl_command(referencing_shard bigint,
																referencing_schema_name text,
																referenced_shard bigint,
																referenced_schema_name text,
																command text)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_apply_inter_shard_ddl_command$$;
COMMENT ON FUNCTION pg_catalog.worker_apply_inter_shard_ddl_command(referencing_shard bigint,
																	referencing_schema_name text,
																	referenced_shard bigint,
																	referenced_schema_name text,
																	command text)
    IS 'executes inter shard ddl command';
/* citus--6.0-13--6.0-14.sql */

DO $ff$
BEGIN
	-- fix functions created in wrong namespace
	ALTER FUNCTION public.recover_prepared_transactions()
	SET SCHEMA pg_catalog;

	ALTER FUNCTION public.column_name_to_column(table_name regclass, column_name text)
	SET SCHEMA pg_catalog;

	ALTER FUNCTION public.worker_drop_distributed_table(logicalrelid Oid)
	SET SCHEMA pg_catalog;

	ALTER FUNCTION public.master_get_new_placementid()
	SET SCHEMA pg_catalog;

	ALTER FUNCTION public.master_expire_table_cache(table_name regclass)
	SET SCHEMA pg_catalog;

-- some installations don't need this corrective, so just skip...
EXCEPTION WHEN undefined_function THEN
	-- do nothing
END
$ff$;
/* citus--6.0-14--6.0-15.sql */


CREATE FUNCTION pg_catalog.master_dist_placement_cache_invalidate()
    RETURNS trigger
    LANGUAGE C
    AS 'MODULE_PATHNAME', $$master_dist_placement_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_placement_cache_invalidate()
    IS 'register relcache invalidation for changed placements';

CREATE TRIGGER dist_placement_cache_invalidate
    AFTER INSERT OR UPDATE OR DELETE
    ON pg_catalog.pg_dist_shard_placement
    FOR EACH ROW EXECUTE PROCEDURE master_dist_placement_cache_invalidate();
/* citus--6.0-15--6.0-16.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION mark_tables_colocated(source_table_name regclass, target_table_names regclass[])
	RETURNS void
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$mark_tables_colocated$$;
COMMENT ON FUNCTION mark_tables_colocated(source_table_name regclass, target_table_names regclass[])
	IS 'mark target distributed tables as colocated with the source table';

RESET search_path;
/* citus--6.0-16--6.0-17.sql */

SET search_path = 'pg_catalog';

DROP FUNCTION pg_catalog.master_copy_shard_placement(bigint, text, integer, text, integer);

CREATE FUNCTION pg_catalog.master_copy_shard_placement(shard_id bigint,
                                                                                                           source_node_name text,
                                                                                                           source_node_port integer,
                                                                                                           target_node_name text,
                                                                                                           target_node_port integer,
                                                                                                           do_repair bool DEFAULT true)
    RETURNS void
    LANGUAGE C STRICT
    AS 'citus', $$master_copy_shard_placement$$;
COMMENT ON FUNCTION pg_catalog.master_copy_shard_placement(shard_id bigint,
                                                                                                           source_node_name text,
                                                                                                           source_node_port integer,
                                                                                                           target_node_name text,
                                                                                                           target_node_port integer,
                                                                                                           do_repair bool)
    IS 'copy shard from remote node';

RESET search_path;
/* citus--6.0-17--6.0-18.sql */

SET search_path = 'pg_catalog';

DROP FUNCTION IF EXISTS master_add_node(text, integer);

CREATE FUNCTION master_add_node(nodename text,                                                
                                nodeport integer,                                             
                                OUT nodeid integer,                                           
                                OUT groupid integer,                                          
                                OUT nodename text,                                            
                                OUT nodeport integer,                                         
                                OUT noderack text,                                            
                                OUT hasmetadata boolean)                                      
    RETURNS record                                                                            
    LANGUAGE C STRICT                                                                         
    AS 'MODULE_PATHNAME', $$master_add_node$$;
COMMENT ON FUNCTION master_add_node(nodename text, nodeport integer)                                         
    IS 'add node to the cluster';
    
RESET search_path;
/* citus--6.0-18--6.1-1.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION start_metadata_sync_to_node(nodename text, nodeport integer)
	RETURNS VOID
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$start_metadata_sync_to_node$$;
COMMENT ON FUNCTION start_metadata_sync_to_node(nodename text, nodeport integer)                                         
    IS 'sync metadata to node';
    
RESET search_path;
/* citus--6.1-1--6.1-2.sql */

SET search_path = 'pg_catalog';
    
CREATE FUNCTION worker_create_truncate_trigger(table_name regclass)
	RETURNS VOID
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$worker_create_truncate_trigger$$;
COMMENT ON FUNCTION worker_create_truncate_trigger(tablename regclass)
	IS 'create truncate trigger for distributed table';
    
RESET search_path;
/* citus--6.1-2--6.1-3.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION stop_metadata_sync_to_node(nodename text, nodeport integer)
	RETURNS VOID
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$stop_metadata_sync_to_node$$;
COMMENT ON FUNCTION stop_metadata_sync_to_node(nodename text, nodeport integer)                                         
    IS 'stop metadata sync to node';
    
RESET search_path;/* citus--6.1-3--6.1-4.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION column_to_column_name(table_name regclass, column_var_text text)
    RETURNS text
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$column_to_column_name$$;
COMMENT ON FUNCTION column_to_column_name(table_name regclass, column_var_text text)
    IS 'convert the textual Var representation to a column name';

RESET search_path;
/* citus--6.1-4--6.1-5.sql */

SET search_path = 'pg_catalog';

DROP FUNCTION create_distributed_table(regclass, text, citus.distribution_type);

CREATE FUNCTION create_distributed_table(table_name regclass,
										 distribution_column text,
										 distribution_type citus.distribution_type DEFAULT 'hash',
										 colocate_with text DEFAULT 'default')
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$create_distributed_table$$;
COMMENT ON FUNCTION create_distributed_table(table_name regclass,
											 distribution_column text,
											 distribution_type citus.distribution_type,
											 colocate_with text)
    IS 'creates a distributed table';

RESET search_path;
/* citus--6.1-5--6.1-6.sql */

SET search_path = 'pg_catalog';

-- we don't need this constraint any more since reference tables 
-- wouldn't have partition columns, which we represent as NULL
ALTER TABLE pg_dist_partition ALTER COLUMN partkey DROP NOT NULL;

RESET search_path;
/* citus--6.1-6--6.1-7.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION get_shard_id_for_distribution_column(table_name regclass, distribution_value "any" DEFAULT NULL)
	RETURNS bigint
	LANGUAGE C
	AS 'MODULE_PATHNAME', $$get_shard_id_for_distribution_column$$;
COMMENT ON FUNCTION get_shard_id_for_distribution_column(table_name regclass, distribution_value "any")
    IS 'return shard id which belongs to given table and contains given value';

RESET search_path;
/* citus--6.1-4--6.1-5.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION lock_shard_resources(lock_mode int, shard_id bigint[])
    RETURNS VOID
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$lock_shard_resources$$;
COMMENT ON FUNCTION lock_shard_resources(lock_mode int, shard_id bigint[])
    IS 'lock shard resource to serialise non-commutative writes';

CREATE FUNCTION lock_shard_metadata(lock_mode int, shard_id bigint[])
    RETURNS VOID
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$lock_shard_metadata$$;
COMMENT ON FUNCTION lock_shard_metadata(lock_mode int, shard_id bigint[])
    IS 'lock shard metadata to prevent writes during metadata changes';

RESET search_path;
/* citus--6.1-8--6.1-9.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION master_drop_distributed_table_metadata(logicalrelid regclass,
                                          			   schema_name text,
                                          			   table_name text)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_drop_distributed_table_metadata$$;
COMMENT ON FUNCTION master_drop_distributed_table_metadata(logicalrelid regclass,
                                              			   schema_name text,
                                              			   table_name text)
    IS 'delete metadata of the distributed table';

CREATE OR REPLACE FUNCTION pg_catalog.citus_drop_trigger()
    RETURNS event_trigger
    LANGUAGE plpgsql
    SECURITY DEFINER
    SET search_path = pg_catalog
    AS $cdbdt$
DECLARE
    v_obj record;
    sequence_names text[] := '{}';
    node_names text[] := '{}';
    node_ports bigint[] := '{}';
    node_name text;
    node_port bigint;
    table_colocation_id integer;
BEGIN
    -- collect set of dropped sequences to drop on workers later
    SELECT array_agg(object_identity) INTO sequence_names
    FROM pg_event_trigger_dropped_objects()
    WHERE object_type = 'sequence';

    -- Must accumulate set of affected nodes before deleting placements, as
    -- master_drop_all_shards will erase their rows, making it impossible for
    -- us to know where to drop sequences (which must be dropped after shards,
    -- since they have default value expressions which depend on sequences).
    SELECT array_agg(sp.nodename), array_agg(sp.nodeport)
    INTO node_names, node_ports
    FROM pg_event_trigger_dropped_objects() AS dobj,
         pg_dist_shard AS s,
         pg_dist_shard_placement AS sp
    WHERE dobj.object_type IN ('table', 'foreign table')
      AND dobj.objid = s.logicalrelid
      AND s.shardid = sp.shardid;

    FOR v_obj IN SELECT * FROM pg_event_trigger_dropped_objects() LOOP
        IF v_obj.object_type NOT IN ('table', 'foreign table') THEN
           CONTINUE;
        END IF;

        -- nothing to do if not a distributed table
        IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE logicalrelid = v_obj.objid) THEN
            CONTINUE;
        END IF;
        
        -- get colocation group
        SELECT colocationid INTO table_colocation_id FROM pg_dist_partition WHERE logicalrelid = v_obj.objid;

        -- ensure all shards are dropped
        PERFORM master_drop_all_shards(v_obj.objid, v_obj.schema_name, v_obj.object_name);
        
        PERFORM master_drop_distributed_table_metadata(v_obj.objid, v_obj.schema_name, v_obj.object_name);

        -- drop colocation group if all referencing tables are dropped
        IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE colocationId = table_colocation_id) THEN
            DELETE FROM pg_dist_colocation WHERE colocationId = table_colocation_id;
        END IF;
    END LOOP;

    IF cardinality(sequence_names) = 0 THEN
        RETURN;
    END IF;

    FOR node_name, node_port IN
    SELECT DISTINCT name, port
    FROM unnest(node_names, node_ports) AS nodes(name, port)
    LOOP
        PERFORM master_drop_sequences(sequence_names, node_name, node_port);
    END LOOP;
END;
$cdbdt$;

COMMENT ON FUNCTION citus_drop_trigger()
    IS 'perform checks and actions at the end of DROP actions';
    
RESET search_path;
/* citus--6.1-9--6.1-10.sql */

GRANT SELECT ON pg_catalog.pg_dist_node TO public;
GRANT SELECT ON pg_catalog.pg_dist_colocation TO public;
GRANT SELECT ON pg_catalog.pg_dist_colocationid_seq TO public;
GRANT SELECT ON pg_catalog.pg_dist_groupid_seq TO public;
GRANT SELECT ON pg_catalog.pg_dist_node_nodeid_seq TO public;
GRANT SELECT ON pg_catalog.pg_dist_shard_placement_placementid_seq TO public;
GRANT SELECT ON pg_catalog.pg_dist_shardid_seq TO public;
GRANT SELECT ON pg_catalog.pg_dist_jobid_seq TO public;
/* citus--6.1-10--6.1-11.sql */

SET search_path = 'pg_catalog';

DROP FUNCTION master_drop_sequences(text[], text, bigint);

CREATE FUNCTION master_drop_sequences(sequence_names text[])
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$master_drop_sequences$$;
COMMENT ON FUNCTION master_drop_sequences(text[])
    IS 'drop specified sequences from the cluster';

CREATE OR REPLACE FUNCTION pg_catalog.citus_drop_trigger()
    RETURNS event_trigger
    LANGUAGE plpgsql
    SECURITY DEFINER
    SET search_path = pg_catalog
    AS $cdbdt$
DECLARE
    v_obj record;
    sequence_names text[] := '{}';
    table_colocation_id integer;
    propagate_drop boolean := false;
BEGIN
    -- collect set of dropped sequences to drop on workers later
    SELECT array_agg(object_identity) INTO sequence_names
    FROM pg_event_trigger_dropped_objects()
    WHERE object_type = 'sequence';
   
    FOR v_obj IN SELECT * FROM pg_event_trigger_dropped_objects() JOIN
                               pg_dist_partition ON (logicalrelid = objid)
                 WHERE object_type IN ('table', 'foreign table')
    LOOP
        -- get colocation group
        SELECT colocationid INTO table_colocation_id FROM pg_dist_partition WHERE logicalrelid = v_obj.objid;

        -- ensure all shards are dropped
        PERFORM master_drop_all_shards(v_obj.objid, v_obj.schema_name, v_obj.object_name);
        
        PERFORM master_drop_distributed_table_metadata(v_obj.objid, v_obj.schema_name, v_obj.object_name);

        -- drop colocation group if all referencing tables are dropped
        IF NOT EXISTS(SELECT * FROM pg_dist_partition WHERE colocationId = table_colocation_id) THEN
            DELETE FROM pg_dist_colocation WHERE colocationId = table_colocation_id;
        END IF;
    END LOOP;

    IF cardinality(sequence_names) = 0 THEN
        RETURN;
    END IF;
    
    PERFORM master_drop_sequences(sequence_names);
END;
$cdbdt$;

COMMENT ON FUNCTION citus_drop_trigger()
    IS 'perform checks and actions at the end of DROP actions';
    
RESET search_path;
/* citus--6.1-11--6.1-12.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION upgrade_to_reference_table(table_name regclass)
    RETURNS void
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$upgrade_to_reference_table$$;
COMMENT ON FUNCTION upgrade_to_reference_table(table_name regclass)
    IS 'upgrades an existing broadcast table to a reference table';
    
RESET search_path;
/* citus--6.1-12--6.1-13.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION master_disable_node(nodename text, nodeport integer)
	RETURNS void
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$master_disable_node$$;
COMMENT ON FUNCTION master_disable_node(nodename text, nodeport integer)
	IS 'removes node from the cluster temporarily';
    
RESET search_path;
/* citus--6.1-13--6.1-14.sql */

CREATE OR REPLACE FUNCTION pg_catalog.master_run_on_worker(worker_name text[],
														   port integer[],
														   command text[],
														   parallel boolean,
														   OUT node_name text,
														   OUT node_port integer,
														   OUT success boolean,
														   OUT result text )
	RETURNS SETOF record
	LANGUAGE C STABLE STRICT
	AS 'MODULE_PATHNAME', $$master_run_on_worker$$;


CREATE TYPE citus.colocation_placement_type AS (
    shardid1 bigint,
    shardid2 bigint,
    nodename text,
    nodeport bigint
);

--
-- distributed_tables_colocated returns true if given tables are co-located, false otherwise.
-- The function checks shard definitions, matches shard placements for given tables.
--
CREATE OR REPLACE FUNCTION pg_catalog.distributed_tables_colocated(table1 regclass,
																   table2 regclass)
    RETURNS bool
    LANGUAGE plpgsql
    AS $function$
DECLARE
	colocated_shard_count int;
	table1_shard_count int;
	table2_shard_count int;
	table1_placement_count int;
	table2_placement_count int;
	table1_placements citus.colocation_placement_type[];
	table2_placements citus.colocation_placement_type[];
BEGIN
	SELECT count(*),
	    (SELECT count(*) FROM pg_dist_shard a WHERE a.logicalrelid = table1),
	    (SELECT count(*) FROM pg_dist_shard b WHERE b.logicalrelid = table2)
	INTO colocated_shard_count, table1_shard_count, table2_shard_count
	FROM pg_dist_shard tba JOIN pg_dist_shard tbb USING(shardminvalue, shardmaxvalue)
	WHERE tba.logicalrelid = table1 AND tbb.logicalrelid = table2;

	IF (table1_shard_count != table2_shard_count OR
		table1_shard_count != colocated_shard_count)
	THEN
		RETURN false;
	END IF;

	WITH colocated_shards AS (
		SELECT tba.shardid as shardid1, tbb.shardid as shardid2
		FROM pg_dist_shard tba JOIN pg_dist_shard tbb USING(shardminvalue, shardmaxvalue)
		WHERE tba.logicalrelid = table1 AND tbb.logicalrelid = table2),
	left_shard_placements AS (
		SELECT cs.shardid1, cs.shardid2, sp.nodename, sp.nodeport 
		FROM colocated_shards cs JOIN pg_dist_shard_placement sp
		ON (cs.shardid1 = sp.shardid)
		WHERE sp.shardstate = 1)
	SELECT 
		array_agg(
			(lsp.shardid1, lsp.shardid2, lsp.nodename, lsp.nodeport)::citus.colocation_placement_type
			ORDER BY shardid1, shardid2, nodename, nodeport),
		count(distinct lsp.shardid1)
	FROM left_shard_placements lsp
	INTO table1_placements, table1_placement_count;

	WITH colocated_shards AS (
		SELECT tba.shardid as shardid1, tbb.shardid as shardid2
		FROM pg_dist_shard tba JOIN pg_dist_shard tbb USING(shardminvalue, shardmaxvalue)
		WHERE tba.logicalrelid = table1 AND tbb.logicalrelid = table2),
	right_shard_placements AS (
		SELECT cs.shardid1, cs.shardid2, sp.nodename, sp.nodeport
		FROM colocated_shards cs LEFT JOIN pg_dist_shard_placement sp ON(cs.shardid2 = sp.shardid)
		WHERE sp.shardstate = 1)
	SELECT
		array_agg(
			(rsp.shardid1, rsp.shardid2, rsp.nodename, rsp.nodeport)::citus.colocation_placement_type
			ORDER BY shardid1, shardid2, nodename, nodeport),
		count(distinct rsp.shardid2)
	FROM right_shard_placements rsp
	INTO table2_placements, table2_placement_count;

	IF (table1_shard_count != table1_placement_count
		OR table1_placement_count != table2_placement_count) THEN
		RETURN false;
	END IF;

	IF (array_length(table1_placements, 1) != array_length(table2_placements, 1)) THEN
		RETURN false;
	END IF;

	FOR i IN  1..array_length(table1_placements,1) LOOP
		IF (table1_placements[i].nodename != table2_placements[i].nodename OR
			table1_placements[i].nodeport != table2_placements[i].nodeport) THEN
			RETURN false;
		END IF;
	END LOOP;

	RETURN true;
END;
$function$;


CREATE OR REPLACE FUNCTION pg_catalog.run_command_on_workers(command text,
													parallel bool default true,
													OUT nodename text,
													OUT nodeport int,
													OUT success bool,
													OUT result text)
	RETURNS SETOF record
	LANGUAGE plpgsql
	AS $function$
DECLARE
	workers text[];
	ports int[];
	commands text[];
BEGIN
	WITH citus_workers AS (
		SELECT * FROM master_get_active_worker_nodes() ORDER BY node_name, node_port)
	SELECT array_agg(node_name), array_agg(node_port), array_agg(command)
	INTO workers, ports, commands
	FROM citus_workers;

	RETURN QUERY SELECT * FROM master_run_on_worker(workers, ports, commands, parallel);
END;
$function$;


CREATE OR REPLACE FUNCTION pg_catalog.run_command_on_placements(table_name regclass,
																command text,
																parallel bool default true,
																OUT nodename text,
																OUT nodeport int,
																OUT shardid bigint,
																OUT success bool,
																OUT result text)
	RETURNS SETOF record
	LANGUAGE plpgsql
	AS $function$
DECLARE
	workers text[];
	ports int[];
	shards bigint[];
	commands text[];
BEGIN
	WITH citus_placements AS (
		SELECT
			ds.logicalrelid::regclass AS tablename,
			ds.shardid AS shardid,
			shard_name(ds.logicalrelid, ds.shardid) AS shardname,
			dsp.nodename AS nodename, dsp.nodeport::int AS nodeport
		FROM pg_dist_shard ds JOIN pg_dist_shard_placement dsp USING (shardid)
		WHERE dsp.shardstate = 1 and ds.logicalrelid::regclass = table_name
		ORDER BY ds.logicalrelid, ds.shardid, dsp.nodename, dsp.nodeport)
	SELECT
		array_agg(cp.nodename), array_agg(cp.nodeport), array_agg(cp.shardid),
		array_agg(format(command, cp.shardname))
	INTO workers, ports, shards, commands
	FROM citus_placements cp;

	RETURN QUERY
		SELECT r.node_name, r.node_port, shards[ordinality],
			r.success, r.result
		FROM master_run_on_worker(workers, ports, commands, parallel) WITH ORDINALITY r;
END;
$function$;


CREATE OR REPLACE FUNCTION pg_catalog.run_command_on_colocated_placements(
																 table_name1 regclass,
																 table_name2 regclass,
																 command text,
																 parallel bool default true,
																 OUT nodename text,
																 OUT nodeport int,
																 OUT shardid1 bigint,
																 OUT shardid2 bigint,
																 OUT success bool,
																 OUT result text)
	RETURNS SETOF record
	LANGUAGE plpgsql
	AS $function$
DECLARE
	workers text[];
	ports int[];
	shards1 bigint[];
	shards2 bigint[];
	commands text[];
BEGIN
	IF NOT (SELECT distributed_tables_colocated(table_name1, table_name2)) THEN
		RAISE EXCEPTION 'tables % and % are not co-located', table_name1, table_name2;
	END IF;

	WITH active_shard_placements AS (
		SELECT
			ds.logicalrelid,
			ds.shardid AS shardid,
			shard_name(ds.logicalrelid, ds.shardid) AS shardname,
			ds.shardminvalue AS shardminvalue,
			ds.shardmaxvalue AS shardmaxvalue,
			dsp.nodename AS nodename,
			dsp.nodeport::int AS nodeport
		FROM pg_dist_shard ds JOIN pg_dist_shard_placement dsp USING (shardid)
		WHERE dsp.shardstate = 1 and (ds.logicalrelid::regclass = table_name1 or
			ds.logicalrelid::regclass = table_name2)
		ORDER BY ds.logicalrelid, ds.shardid, dsp.nodename, dsp.nodeport),
	citus_colocated_placements AS (
		SELECT
			a.logicalrelid::regclass AS tablename1,
			a.shardid AS shardid1,
			shard_name(a.logicalrelid, a.shardid) AS shardname1,
			b.logicalrelid::regclass AS tablename2,
			b.shardid AS shardid2,
			shard_name(b.logicalrelid, b.shardid) AS shardname2,
			a.nodename AS nodename,
			a.nodeport::int AS nodeport
		FROM
			active_shard_placements a, active_shard_placements b
		WHERE
			a.shardminvalue = b.shardminvalue AND
			a.shardmaxvalue = b.shardmaxvalue AND
			a.logicalrelid != b.logicalrelid AND
			a.nodename = b.nodename AND
			a.nodeport = b.nodeport AND
			a.logicalrelid::regclass = table_name1 AND
			b.logicalrelid::regclass = table_name2
		ORDER BY a.logicalrelid, a.shardid, nodename, nodeport)
	SELECT
		array_agg(cp.nodename), array_agg(cp.nodeport), array_agg(cp.shardid1),
		array_agg(cp.shardid2), array_agg(format(command, cp.shardname1, cp.shardname2))
	INTO workers, ports, shards1, shards2, commands
  	FROM citus_colocated_placements cp;

	RETURN QUERY SELECT r.node_name, r.node_port, shards1[ordinality],
		shards2[ordinality], r.success, r.result
	FROM master_run_on_worker(workers, ports, commands, parallel) WITH ORDINALITY r;
END;
$function$;


CREATE OR REPLACE FUNCTION pg_catalog.run_command_on_shards(table_name regclass,
															command text,
															parallel bool default true,
															OUT shardid bigint,
															OUT success bool,
															OUT result text)
	RETURNS SETOF record
	LANGUAGE plpgsql
	AS $function$
DECLARE
	workers text[];
	ports int[];
	shards bigint[];
	commands text[];
	shard_count int;
BEGIN
	SELECT COUNT(*) INTO shard_count FROM pg_dist_shard
	WHERE logicalrelid = table_name;

	WITH citus_shards AS (
		SELECT ds.logicalrelid::regclass AS tablename,
			ds.shardid AS shardid,
			shard_name(ds.logicalrelid, ds.shardid) AS shardname,
			array_agg(dsp.nodename) AS nodenames,
			array_agg(dsp.nodeport) AS nodeports
		FROM pg_dist_shard ds LEFT JOIN pg_dist_shard_placement dsp USING (shardid)
		WHERE dsp.shardstate = 1 and ds.logicalrelid::regclass = table_name
		GROUP BY ds.logicalrelid, ds.shardid
		ORDER BY ds.logicalrelid, ds.shardid)
	SELECT
		array_agg(cs.nodenames[1]), array_agg(cs.nodeports[1]), array_agg(cs.shardid),
		array_agg(format(command, cs.shardname))
	INTO workers, ports, shards, commands
	FROM citus_shards cs;

	IF (shard_count != array_length(workers, 1)) THEN
		RAISE NOTICE 'some shards do  not have active placements';
	END IF;

	RETURN QUERY
		SELECT shards[ordinality], r.success, r.result
		FROM master_run_on_worker(workers, ports, commands, parallel) WITH ORDINALITY r;
END;
$function$;
/* citus--6.1-14--6.1-15.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION master_dist_local_group_cache_invalidate()
    RETURNS trigger
    LANGUAGE C
    AS 'MODULE_PATHNAME', $$master_dist_local_group_cache_invalidate$$;
COMMENT ON FUNCTION master_dist_local_group_cache_invalidate()
    IS 'register node cache invalidation for changed rows';
    
CREATE TRIGGER dist_local_group_cache_invalidate
    AFTER UPDATE
    ON pg_catalog.pg_dist_local_group
    FOR EACH ROW EXECUTE PROCEDURE master_dist_local_group_cache_invalidate();
    
RESET search_path;
/* citus--6.1-15--6.1-16.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION worker_apply_sequence_command(text)
    RETURNS VOID
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_apply_sequence_command$$;
COMMENT ON FUNCTION worker_apply_sequence_command(text)
    IS 'create a sequence which products globally unique values';
    
RESET search_path;
/* citus--6.1-16--6.1-17.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION isolate_tenant_to_new_shard(table_name regclass, tenant_id "any", cascade_option text DEFAULT '')
	RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$isolate_tenant_to_new_shard$$;
COMMENT ON FUNCTION isolate_tenant_to_new_shard(table_name regclass, tenant_id "any", cascade_option text)
    IS 'isolate a tenant to its own shard and return the new shard id';

CREATE FUNCTION worker_hash(value "any")
	RETURNS integer
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$worker_hash$$;
COMMENT ON FUNCTION worker_hash(value "any")
    IS 'calculate hashed value and return it';

RESET search_path;
/* citus--6.1-17--6.2-1.sql */

SET search_path = 'pg_catalog';

DROP FUNCTION IF EXISTS master_get_local_first_candidate_nodes();
DROP FUNCTION IF EXISTS master_get_round_robin_candidate_nodes();

DROP FUNCTION IF EXISTS master_stage_shard_row();
DROP FUNCTION IF EXISTS master_stage_shard_placement_row();

RESET search_path;
/* citus--6.2-1--6.2-2.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION citus_table_size(logicalrelid regclass)
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$citus_table_size$$;
COMMENT ON FUNCTION citus_table_size(logicalrelid regclass)
    IS 'get disk space used by the specified table, excluding indexes';
    
CREATE FUNCTION citus_relation_size(logicalrelid regclass)
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$citus_relation_size$$;
COMMENT ON FUNCTION citus_relation_size(logicalrelid regclass)
    IS 'get disk space used by the ''main'' fork';
    
CREATE FUNCTION citus_total_relation_size(logicalrelid regclass)
    RETURNS bigint
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$citus_total_relation_size$$;
COMMENT ON FUNCTION citus_total_relation_size(logicalrelid regclass)
    IS 'get total disk space used by the specified table';
    
RESET search_path;
/* citus--6.2-2--6.2-3.sql */

SET search_path = 'pg_catalog';

ALTER TABLE pg_dist_node ADD isactive bool NOT NULL DEFAULT true;

DROP FUNCTION IF EXISTS master_add_node(text, integer);

CREATE FUNCTION master_add_node(nodename text,
                                nodeport integer,
                                OUT nodeid integer,
                                OUT groupid integer,
                                OUT nodename text,
                                OUT nodeport integer,
                                OUT noderack text,
                                OUT hasmetadata boolean,
                                OUT isactive bool)
    RETURNS record 
    LANGUAGE C STRICT 
    AS 'MODULE_PATHNAME',$$master_add_node$$;
COMMENT ON FUNCTION master_add_node(nodename text, nodeport integer)
    IS 'add node to the cluster'; 

CREATE FUNCTION master_add_inactive_node(nodename text,
                                         nodeport integer,
                                         OUT nodeid integer,
                                         OUT groupid integer,
                                         OUT nodename text,
                                         OUT nodeport integer,
                                         OUT noderack text,
                                         OUT hasmetadata boolean,
                                         OUT isactive bool)
    RETURNS record 
    LANGUAGE C STRICT 
    AS 'MODULE_PATHNAME',$$master_add_inactive_node$$;
COMMENT ON FUNCTION master_add_inactive_node(nodename text,nodeport integer)
    IS 'prepare node by adding it to pg_dist_node';

CREATE FUNCTION master_activate_node(nodename text,
                                     nodeport integer,
                                     OUT nodeid integer,
                                     OUT groupid integer,
                                     OUT nodename text,
                                     OUT nodeport integer,
                                     OUT noderack text,
                                     OUT hasmetadata boolean,
                                     OUT isactive bool)
    RETURNS record 
    LANGUAGE C STRICT 
    AS 'MODULE_PATHNAME',$$master_activate_node$$;
COMMENT ON FUNCTION master_activate_node(nodename text, nodeport integer)
    IS 'activate a node which is in the cluster'; 

RESET search_path;
/* citus--6.2-3--6.2-4.sql */

CREATE OR REPLACE FUNCTION pg_catalog.citus_truncate_trigger()
    RETURNS trigger
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME', $$citus_truncate_trigger$$;
COMMENT ON FUNCTION pg_catalog.citus_truncate_trigger()
    IS 'trigger function called when truncating the distributed table';
/* citus--6.2-4--7.0-1.sql */

/* empty, but required to update the extension version */
/* citus--7.0-1--7.0-2.sql */

/* redefine shard_name as STRICT */
CREATE OR REPLACE FUNCTION pg_catalog.shard_name(object_name regclass, shard_id bigint)
    RETURNS text
    LANGUAGE C STABLE STRICT
    AS 'MODULE_PATHNAME', $$shard_name$$;
COMMENT ON FUNCTION pg_catalog.shard_name(object_name regclass, shard_id bigint)
    IS 'returns schema-qualified, shard-extended identifier of object name';
/* citus--7.0-2--7.0-3.sql */

ALTER SEQUENCE pg_catalog.pg_dist_shard_placement_placementid_seq
  RENAME TO pg_dist_placement_placementid_seq;

ALTER TABLE pg_catalog.pg_dist_shard_placement
  ALTER COLUMN placementid SET DEFAULT nextval('pg_catalog.pg_dist_placement_placementid_seq');

CREATE TABLE citus.pg_dist_placement (
  placementid BIGINT NOT NULL default nextval('pg_dist_placement_placementid_seq'::regclass),
  shardid BIGINT NOT NULL,
  shardstate INT NOT NULL,
  shardlength BIGINT NOT NULL,
  groupid INT NOT NULL
);
ALTER TABLE citus.pg_dist_placement SET SCHEMA pg_catalog;
GRANT SELECT ON pg_catalog.pg_dist_placement TO public;

CREATE INDEX pg_dist_placement_groupid_index
  ON pg_dist_placement USING btree(groupid);

CREATE INDEX pg_dist_placement_shardid_index
  ON pg_dist_placement USING btree(shardid);

CREATE UNIQUE INDEX pg_dist_placement_placementid_index
  ON pg_dist_placement USING btree(placementid);

CREATE OR REPLACE FUNCTION citus.find_groupid_for_node(text, int)
RETURNS int AS $$
DECLARE
  groupid int := (SELECT groupid FROM pg_dist_node WHERE nodename = $1 AND nodeport = $2);
BEGIN
  IF groupid IS NULL THEN
    RAISE EXCEPTION 'There is no node at "%:%"', $1, $2;
  ELSE
    RETURN groupid;
  END IF;
END;
$$ LANGUAGE plpgsql;

INSERT INTO pg_catalog.pg_dist_placement
SELECT placementid, shardid, shardstate, shardlength,
       citus.find_groupid_for_node(placement.nodename, placement.nodeport::int) AS groupid
FROM pg_dist_shard_placement placement;

DROP TRIGGER dist_placement_cache_invalidate ON pg_catalog.pg_dist_shard_placement;
CREATE TRIGGER dist_placement_cache_invalidate
    AFTER INSERT OR UPDATE OR DELETE
    ON pg_catalog.pg_dist_placement
    FOR EACH ROW EXECUTE PROCEDURE master_dist_placement_cache_invalidate();

-- this should be removed when noderole is added but for now it ensures the below view
-- returns the correct results and that placements unambiguously belong to a view
ALTER TABLE pg_catalog.pg_dist_node ADD CONSTRAINT pg_dist_node_groupid_unique
  UNIQUE (groupid);

DROP TABLE pg_dist_shard_placement;
CREATE VIEW citus.pg_dist_shard_placement AS
SELECT shardid, shardstate, shardlength, nodename, nodeport, placementid
-- assumes there's only one node per group
FROM pg_dist_placement placement INNER JOIN pg_dist_node node ON (
  placement.groupid = node.groupid
);
ALTER VIEW citus.pg_dist_shard_placement SET SCHEMA pg_catalog;
GRANT SELECT ON pg_catalog.pg_dist_shard_placement TO public;

-- add some triggers which make it look like pg_dist_shard_placement is still a table

ALTER VIEW pg_catalog.pg_dist_shard_placement
  ALTER placementid SET DEFAULT nextval('pg_dist_placement_placementid_seq');

CREATE OR REPLACE FUNCTION citus.pg_dist_shard_placement_trigger_func()
RETURNS TRIGGER AS $$
  BEGIN
    IF (TG_OP = 'DELETE') THEN
      DELETE FROM pg_dist_placement WHERE placementid = OLD.placementid;
      RETURN OLD;
    ELSIF (TG_OP = 'UPDATE') THEN
      UPDATE pg_dist_placement
        SET shardid = NEW.shardid, shardstate = NEW.shardstate,
            shardlength = NEW.shardlength, placementid = NEW.placementid,
            groupid = citus.find_groupid_for_node(NEW.nodename, NEW.nodeport)
        WHERE placementid = OLD.placementid;
      RETURN NEW;
    ELSIF (TG_OP = 'INSERT') THEN
      INSERT INTO pg_dist_placement
        (placementid, shardid, shardstate, shardlength, groupid)
      VALUES (NEW.placementid, NEW.shardid, NEW.shardstate, NEW.shardlength,
        citus.find_groupid_for_node(NEW.nodename, NEW.nodeport));
      RETURN NEW;
    END IF;
  END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER pg_dist_shard_placement_trigger
  INSTEAD OF INSERT OR UPDATE OR DELETE ON pg_dist_shard_placement
  FOR EACH ROW EXECUTE PROCEDURE citus.pg_dist_shard_placement_trigger_func();
/* citus--7.0-3--7.0-4.sql */

SET search_path = 'pg_catalog';

CREATE FUNCTION assign_distributed_transaction_id(initiator_node_identifier int4, transaction_number int8, transaction_stamp timestamptz)
     RETURNS void
     LANGUAGE C STRICT
     AS 'MODULE_PATHNAME',$$assign_distributed_transaction_id$$;
 COMMENT ON FUNCTION assign_distributed_transaction_id(initiator_node_identifier int4, transaction_number int8, transaction_stamp timestamptz)
     IS 'Only intended for internal use, users should not call this. The function sets the distributed transaction id';

CREATE OR REPLACE FUNCTION get_current_transaction_id(OUT database_id oid, OUT process_id int, OUT initiator_node_identifier int4, OUT transaction_number int8, OUT transaction_stamp timestamptz)
     RETURNS RECORD
     LANGUAGE C STRICT
     AS 'MODULE_PATHNAME',$$get_current_transaction_id$$;
 COMMENT ON FUNCTION get_current_transaction_id(OUT database_id oid, OUT process_id int, OUT initiator_node_identifier int4, OUT transaction_number int8, OUT transaction_stamp timestamptz)
     IS 'returns the current backend data including distributed transaction id';

CREATE OR REPLACE FUNCTION get_all_active_transactions(OUT database_id oid, OUT process_id int, OUT initiator_node_identifier int4, OUT transaction_number int8, OUT transaction_stamp timestamptz)
	RETURNS SETOF RECORD
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$get_all_active_transactions$$;
 COMMENT ON FUNCTION get_all_active_transactions(OUT database_id oid, OUT process_id int, OUT initiator_node_identifier int4, OUT transaction_number int8, OUT transaction_stamp timestamptz)
     IS 'returns distributed transaction ids of active distributed transactions';

RESET search_path;
/* citus--7.0-4--7.0-5.sql */

SET search_path = 'pg_catalog';

CREATE TYPE pg_catalog.noderole AS ENUM (
  'primary',     -- node is available and accepting writes
  'secondary',   -- node is available but only accepts reads
  'unavailable' -- node is in recovery or otherwise not usable
-- adding new values to a type inside of a transaction (such as during an ALTER EXTENSION
-- citus UPDATE) isn't allowed in PG 9.6, and only allowed in PG10 if you don't use the
-- new values inside of the same transaction. You might need to replace this type with a
-- new one and then change the column type in pg_dist_node. There's a list of
-- alternatives here:
-- https://stackoverflow.com/questions/1771543/postgresql-updating-an-enum-type/41696273
);

ALTER TABLE pg_dist_node ADD COLUMN noderole noderole NOT NULL DEFAULT 'primary';

-- we're now allowed to have more than one node per group
ALTER TABLE pg_catalog.pg_dist_node DROP CONSTRAINT pg_dist_node_groupid_unique;

-- so make sure pg_dist_shard_placement only returns writable placements
CREATE OR REPLACE VIEW pg_catalog.pg_dist_shard_placement AS
  SELECT shardid, shardstate, shardlength, nodename, nodeport, placementid
  FROM pg_dist_placement placement INNER JOIN pg_dist_node node ON (
    placement.groupid = node.groupid AND node.noderole = 'primary'
  );

CREATE OR REPLACE FUNCTION citus.pg_dist_node_trigger_func()
RETURNS TRIGGER AS $$
  BEGIN
    /* AddNodeMetadata also takes out a ShareRowExclusiveLock */
    LOCK TABLE pg_dist_node IN SHARE ROW EXCLUSIVE MODE;
    IF (TG_OP = 'INSERT') THEN
      IF NEW.noderole = 'primary'
          AND EXISTS (SELECT 1 FROM pg_dist_node WHERE groupid = NEW.groupid AND
                                                       noderole = 'primary' AND
                                                       nodeid <> NEW.nodeid) THEN
        RAISE EXCEPTION 'there cannot be two primary nodes in a group';
      END IF;
      RETURN NEW;
    ELSIF (TG_OP = 'UPDATE') THEN
      IF NEW.noderole = 'primary'
           AND EXISTS (SELECT 1 FROM pg_dist_node WHERE groupid = NEW.groupid AND
                                                        noderole = 'primary' AND
                                                        nodeid <> NEW.nodeid) THEN
         RAISE EXCEPTION 'there cannot be two primary nodes in a group';
      END IF;
      RETURN NEW;
    END IF;
  END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER pg_dist_node_trigger
  BEFORE INSERT OR UPDATE ON pg_dist_node
  FOR EACH ROW EXECUTE PROCEDURE citus.pg_dist_node_trigger_func();

DROP FUNCTION master_add_node(text, integer);
CREATE FUNCTION master_add_node(nodename text,
                                nodeport integer,
                                groupid integer default 0,
                                noderole noderole default 'primary',
                                OUT nodeid integer,
                                OUT groupid integer,
                                OUT nodename text,
                                OUT nodeport integer,
                                OUT noderack text,
                                OUT hasmetadata boolean,
                                OUT isactive bool,
                                OUT noderole noderole)
  RETURNS record
  LANGUAGE C STRICT
  AS 'MODULE_PATHNAME', $$master_add_node$$;
COMMENT ON FUNCTION master_add_node(nodename text, nodeport integer,
                                    groupid integer, noderole noderole)
  IS 'add node to the cluster';

DROP FUNCTION master_add_inactive_node(text, integer);
CREATE FUNCTION master_add_inactive_node(nodename text,
                                         nodeport integer,
                                         groupid integer default 0,
                                         noderole noderole default 'primary',
                                         OUT nodeid integer,
                                         OUT groupid integer,
                                         OUT nodename text,
                                         OUT nodeport integer,
                                         OUT noderack text,
                                         OUT hasmetadata boolean,
                                         OUT isactive bool,
                                         OUT noderole noderole)
  RETURNS record
  LANGUAGE C STRICT
  AS 'MODULE_PATHNAME',$$master_add_inactive_node$$;
COMMENT ON FUNCTION master_add_inactive_node(nodename text,nodeport integer,
                                             groupid integer, noderole noderole)
  IS 'prepare node by adding it to pg_dist_node';

RESET search_path;
/* citus--7.0-5--7.0-6 */

CREATE FUNCTION pg_catalog.dump_local_wait_edges(
                    IN source_node_id int4,
                    OUT waiting_pid int4,
                    OUT waiting_node_id int4,
                    OUT waiting_transaction_num int8,
                    OUT waiting_transaction_stamp timestamptz,
                    OUT blocking_pid int4,
                    OUT blocking_node_id int4,
                    OUT blocking_transaction_num int8,
                    OUT blocking_transaction_stamp timestamptz,
                    OUT blocking_transaction_waiting bool)
RETURNS SETOF RECORD
LANGUAGE 'c' STRICT
AS $$MODULE_PATHNAME$$, $$dump_local_wait_edges$$;
COMMENT ON FUNCTION pg_catalog.dump_local_wait_edges(int)
IS 'returns a local list of blocked transactions originating from source_node_id';

CREATE FUNCTION pg_catalog.dump_global_wait_edges(
                    OUT waiting_pid int4,
                    OUT waiting_node_id int4,
                    OUT waiting_transaction_num int8,
                    OUT waiting_transaction_stamp timestamptz,
                    OUT blocking_pid int4,
                    OUT blocking_node_id int4,
                    OUT blocking_transaction_num int8,
                    OUT blocking_transaction_stamp timestamptz,
                    OUT blocking_transaction_waiting bool)
RETURNS SETOF RECORD
LANGUAGE 'c' STRICT
AS $$MODULE_PATHNAME$$, $$dump_global_wait_edges$$;
COMMENT ON FUNCTION pg_catalog.dump_global_wait_edges()
IS 'returns a global list of blocked transactions originating from this node';
/* citus--7.0-6--7.0-7 */

CREATE FUNCTION citus.replace_isolation_tester_func()
RETURNS void AS $$
  DECLARE
    version integer := current_setting('server_version_num');
  BEGIN
    IF version >= 100000 THEN
      ALTER FUNCTION pg_catalog.pg_isolation_test_session_is_blocked(integer, integer[])
        RENAME TO old_pg_isolation_test_session_is_blocked;
      ALTER FUNCTION pg_catalog.citus_isolation_test_session_is_blocked(integer, integer[])
        RENAME TO pg_isolation_test_session_is_blocked;
    ELSE
      ALTER FUNCTION pg_catalog.pg_blocking_pids(integer)
        RENAME TO old_pg_blocking_pids;
      ALTER FUNCTION pg_catalog.citus_blocking_pids(integer)
        RENAME TO pg_blocking_pids;
    END IF;
  END;
$$ LANGUAGE plpgsql;

CREATE FUNCTION citus.restore_isolation_tester_func()
RETURNS void AS $$
  DECLARE
    version integer := current_setting('server_version_num');
  BEGIN
    IF version >= 100000 THEN
      ALTER FUNCTION pg_catalog.pg_isolation_test_session_is_blocked(integer, integer[])
        RENAME TO citus_isolation_test_session_is_blocked;
      ALTER FUNCTION pg_catalog.old_pg_isolation_test_session_is_blocked(integer, integer[])
        RENAME TO pg_isolation_test_session_is_blocked;
    ELSE
      ALTER FUNCTION pg_catalog.pg_blocking_pids(integer)
        RENAME TO citus_blocking_pids;
      ALTER FUNCTION pg_catalog.old_pg_blocking_pids(integer)
        RENAME TO pg_blocking_pids;
    END IF;
  END;
$$ LANGUAGE plpgsql;

CREATE FUNCTION citus.refresh_isolation_tester_prepared_statement()
RETURNS void AS $$
  BEGIN
    -- isolation creates a prepared statement using the old function before tests have a
    -- chance to call replace_isolation_tester_func. By calling that prepared statement
    -- with a different search_path we force a re-parse which picks up the new function
    SET search_path TO 'citus';
    EXECUTE 'EXECUTE isolationtester_waiting (0)';
    RESET search_path;
  END;
$$ LANGUAGE plpgsql;

CREATE FUNCTION pg_catalog.citus_blocking_pids(pBlockedPid integer)
RETURNS int4[] AS $$
  DECLARE
    mLocalBlockingPids int4[];
    mRemoteBlockingPids int4[];
    mLocalTransactionNum int8;
  BEGIN
    SELECT pg_catalog.old_pg_blocking_pids(pBlockedPid) INTO mLocalBlockingPids;

    IF (array_length(mLocalBlockingPids, 1) > 0) THEN
      RETURN mLocalBlockingPids;
    END IF;

    -- pg says we're not blocked locally; check whether we're blocked globally.
    SELECT transaction_number INTO mLocalTransactionNum
      FROM get_all_active_transactions() WHERE process_id = pBlockedPid;
    
    SELECT array_agg(process_id) INTO mRemoteBlockingPids FROM (
      WITH activeTransactions AS (
        SELECT process_id, transaction_number FROM get_all_active_transactions()
      ), blockingTransactions AS (
        SELECT blocking_transaction_num AS txn_num FROM dump_global_wait_edges()
        WHERE waiting_transaction_num = mLocalTransactionNum
      )
      SELECT activeTransactions.process_id FROM activeTransactions, blockingTransactions
      WHERE activeTransactions.transaction_number = blockingTransactions.txn_num
    ) AS sub;

    RETURN mRemoteBlockingPids;
  END;
$$ LANGUAGE plpgsql;

CREATE FUNCTION pg_catalog.citus_isolation_test_session_is_blocked(pBlockedPid integer, pInterestingPids integer[])
RETURNS boolean AS $$
  DECLARE
    mBlockedTransactionNum int8;
  BEGIN
    IF pg_catalog.old_pg_isolation_test_session_is_blocked(pBlockedPid, pInterestingPids) THEN
      RETURN true;
    END IF;

    -- pg says we're not blocked locally; check whether we're blocked globally.
    SELECT transaction_number INTO mBlockedTransactionNum
      FROM get_all_active_transactions() WHERE process_id = pBlockedPid;

    RETURN EXISTS (
      SELECT 1 FROM dump_global_wait_edges()
        WHERE waiting_transaction_num = mBlockedTransactionNum
    );
  END;
$$ LANGUAGE plpgsql;
/* citus--7.0-7--7.0-8.sql */

SET search_path = 'pg_catalog';

DROP FUNCTION master_activate_node(text, integer);
CREATE FUNCTION master_activate_node(nodename text,
                                     nodeport integer,
                                     OUT nodeid integer,
                                     OUT groupid integer,
                                     OUT nodename text,
                                     OUT nodeport integer,
                                     OUT noderack text,
                                     OUT hasmetadata boolean,
                                     OUT isactive bool,
                                     OUT noderole noderole)
    RETURNS record
    LANGUAGE C STRICT
    AS 'MODULE_PATHNAME',$$master_activate_node$$;
COMMENT ON FUNCTION master_activate_node(nodename text, nodeport integer)
    IS 'activate a node which is in the cluster';

RESET search_path;