Fix amcheck child check pg_upgrade bug.

Commit d114cc53 overlooked the fact that pg_upgrade'd B-Tree indexes
have leaf page high keys whose offset numbers do not match the one from
the copy of the tuple one level up (the copy stored with a downlink for
leaf page's right sibling page).  This led to false positive reports of
corruption from bt_index_parent_check() when it was called to verify a
pg_upgrade'd index.

To fix, skip comparing the offset number on pg_upgrade'd B-Tree indexes.

Author: Anastasia Lubennikova <[email protected]>
Author: Peter Geoghegan <[email protected]>
Reported-By: Andrew Bille <[email protected]>
Diagnosed-By: Anastasia Lubennikova <[email protected]>
Bug: #16619
Discussion: https://postgr.es/m/[email protected]
Backpatch: 13-, where child check was enhanced.

0 files changed, 0 insertions, 0 deletions