/usr/share/postgresql/9.6/extension/citus--5.1-2--5.1-3.sql is in postgresql-9.6-citus 6.0.1.PGDG-1.
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The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | DROP FUNCTION IF EXISTS public.master_update_shard_statistics(shard_id bigint);
CREATE OR REPLACE FUNCTION pg_catalog.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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