Test that vacuum removes tuples older than OldestXmin

Ensure vacuum removes all visibly dead tuples older than OldestXmin

Give better hints for ambiguous or unreferenceable columns.

doc: use FILTER in aggregate example

doc: Add a note on PO editors

vacuumlazy.c: Standardize rel_pages terminology.

vacuumlazy.c: document vistest and OldestXmin.

heap pruning: Only call BufferGetBlockNumber() once.

Assert redirect pointers are sensible after heap_page_prune().

Fix possible HOT corruption when RECENTLY_DEAD changes to DEAD while pruning.

Flush Memoize cache when non-key parameters change, take 2

Flush Memoize cache when non-key parameters change

Add hardening to catch invalid TIDs in indexes.

Add various assertions to heap pruning code.

Don't overlook indexes during parallel VACUUM.

Further harden nbtree posting split code.

Pipeline mode disallows multicommand strings

Don't try to read a multi-GB pg_stat_statements file in one call.