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Changes needed for PG 18 - #529
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When VarlenaWrapper wants to save a TOASTed value that may possibly be wanted later, it can use the least memory if it just retains the TOAST pointer and registers a current snapshot in which it is visible. In PG 9.6, a GetOldestSnapshot function appeared and made that possible. As of PG 18, with postgres/postgres@4d82750, that function has vanished, but there is a new one, get_toast_snapshot, that appears to fit the bill. It's only declared in access/toast_internals.h, though, which isn't otherwise needed. Addresses #524.
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When
VarlenaWrapperwants to save a TOASTed value that may possibly be wanted later, it can use the least memory if it just retains the TOAST pointer and registers a current snapshot in which it is visible. In PG 9.6, aGetOldestSnapshotfunction appeared and made that possible. As of PG 18, with postgres/postgres@4d82750, that function has vanished, but there is a new one,get_toast_snapshot, that appears to fit the bill. It's only declared inaccess/toast_internals.h, though, which isn't otherwise needed.Addresses #524.