On Wed, Aug 11, 2021 at 10:45 PM Dilip Kumar <dilipbal...@gmail.com> wrote:
> Yeah we can avoid that by detecting any toasted replica identity key > in HeapDetermineModifiedColumns, check the attached patch. > I had a second look at this, and I just had a small doubt. Since the convention is that for UPDATES, the old tuple/key is written to WAL only if the one of the columns in the key has changed as part of the update, and we are breaking that convention with this patch by also including the old key if it is toasted and is stored in disk even if it is not changed. Why do we not include the detoasted key as part of the new tuple rather than the old tuple? Then we don't really break this convention. And one small typo in the patch: The header above ExtractReplicaIdentity() Before: * key_required should be false if caller knows that no replica identity * columns changed value and it doesn't has any external data. * It's always true in the DELETE case. After: * key_required should be false if caller knows that no replica identity * columns changed value and it doesn't have any external data. * It's always true in the DELETE case. regards, Ajin Cherian Fujitsu Australia
