/usr/share/postgresql/10/extension/citus--7.0-13--7.0-14.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--7.0-13--7.0-14.sql */
SET search_path = 'pg_catalog';
CREATE OR REPLACE FUNCTION check_distributed_deadlocks()
RETURNS BOOL
LANGUAGE 'c' STRICT
AS $$MODULE_PATHNAME$$, $$check_distributed_deadlocks$$;
COMMENT ON FUNCTION check_distributed_deadlocks()
IS 'does a distributed deadlock check, if a deadlock found cancels one of the participating backends and returns true ';
RESET search_path;
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