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Commit 0c5d626961 was confused about which indexes are potentially
problematic to rebuild: we thought only !indisready indexes could fail
to rebuild, and thus would attempt to rebuild !indisvalid ones that are
"ready" (that is, being maintained by DML but not yet completed).
However, that's wrong, because it could be that the validation phase of
such an index failed or was interrupted partway through. So, have
REPACK throw an error with all !indisvalid indexes, not just those
!indisready.
(!indisready implies !indisvalid, so this is an expansion of what
happened with the previous commit.)
Reported-by: shihao zhong <zhong950419@gmail.com>
Backpatch-through: 19
Discussion: https://postgr.es/m/CAGRkXqRA4YetT8Nu3+1-45+ffTwi2bd1d1eDFME39Y9OPRMytQ@mail.gmail.com