/usr/share/postgresql/10/extension/citus--6.1-6--6.1-7.sql is in postgresql-10-citus 7.0.3.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 | /* 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;
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