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This function returns the chunk_id of an on-disk TOASTed value. If the value is un-TOASTed or not on-disk, it returns NULL. This is useful for identifying which values are actually TOASTed and for investigating "unexpected chunk number" errors. Bumps catversion. Author: Yugo Nagata Reviewed-by: Jian He Discussion: https://postgr.es/m/20230329105507.d764497456eeac1ca491b5bd%40sraoss.co.jp