/usr/share/postgresql/9.6/extension/citus--5.0-1--5.0-2.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 | /* 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';
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