/usr/share/postgresql/10/extension/citus--6.1-17--6.2-1.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 | /* 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;
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