/usr/share/postgresql/9.6/extension/citus--6.0-17--6.0-18.sql is in postgresql-9.6-citus 6.0.1.PGDG-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* 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;
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