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The gist_page_items() function opened the index relation on first call and closed it on the last call. But there's no guarantee that the function is run to completion, leading to a relcache leak and warning at the end of the transaction. To fix, refactor the function to return all the rows in one call, as a tuplestore. Reported-by: Tom Lane Discussion: https://www.postgresql.org/message-id/234863.1610916631%40sss.pgh.pa.us