the bottom half might be messed up too. So we are failing to exploit
the full intended "sign" space, which presumably is costing something
in index efficiency.
You are absolutly right. My fault.
It looks to me like the values calculated by this routine end up on
disk, and therefore we can't fix it without forcing an initdb, or
at least REINDEX of all affected indexes. Is that correct?
No. query_gist.c exists only in HEAD branch. That code is devloped
not a lot time ago, and itsn't tested well yet.
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