Hi! While reviewing other threads implementing stream API for various core subsystems, I spotted that pgstattuple could also benefit from that. So, PFA.
Notice refactoring around pgstat_hash_page and changes in pgstat_page signature. This is needed because pgstat_hash_tuple uses _hash_getbuf_with_strategy rather than ReadBufferExtended, which is OK, but makes adapting the streaming API impossible. So, I changed this place. Old codes should behave exactly the same way as new ones. I eliminated the additional check that _hash_getbuf_with_strategy performed, which was blkno == P_NEW. However, since the streaming API already delivers the right buffer, I think it's okay. This change behaves sanely on my by-hand testing. -- Best regards, Kirill Reshke
v1-0001-Use-stream-read-interface-for-pgstattuple-routine.patch
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