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/usr/share/postgresql/9.6/extension/citus--5.2-2--5.2-3.sql is in postgresql-9.6-citus 6.0.1.PGDG-1.

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/* citus--5.2-2--5.2-3.sql */
CREATE OR REPLACE FUNCTION master_expire_table_cache(table_name regclass)
	RETURNS VOID
	LANGUAGE C STRICT
	AS 'MODULE_PATHNAME', $$master_expire_table_cache$$;