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Set indcheckxmin true when REINDEX fixes an invalid or not-ready index.

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Per comment from Greg Stark, it's less clear that HOT chains don't conflict
with the index than it would be for a valid index.  So, let's preserve the
former behavior that indcheckxmin does get set when there are
potentially-broken HOT chains in this case.  This change does not cause any
pg_index update that wouldn't have happened anyway, so we're not
re-introducing the previous bug with pg_index updates, and surely the case
is not significant from a performance standpoint; so let's be as
conservative as possible.
This commit is contained in:
Tom Lane 2011-04-20 19:01:25 -04:00
parent 8a6d60fd0c
commit 1d6249d64d
1 changed files with 10 additions and 3 deletions
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13
src/backend/catalog/index.c
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@ -2494,7 +2494,12 @@ reindex_index(Oid indexId, bool skip_constraint_checks)
*
* We can also reset indcheckxmin, because we have now done a
* non-concurrent index build, *except* in the case where index_build
* found some still-broken HOT chains.
* found some still-broken HOT chains. If it did, we normally leave
* indcheckxmin alone (note that index_build won't have changed it,
* because this is a reindex). But if the index was invalid or not ready
* and there were broken HOT chains, it seems best to force indcheckxmin
* true, because the normal argument that the HOT chains couldn't conflict
* with the index is suspect for an invalid index.
*
* Note that it is important to not update the pg_index entry if we don't
* have to, because updating it will move the index's usability horizon
@ -2519,10 +2524,12 @@ reindex_index(Oid indexId, bool skip_constraint_checks)
if (!indexForm->indisvalid || !indexForm->indisready ||
(indexForm->indcheckxmin && !indexInfo->ii_BrokenHotChain))
{
indexForm->indisvalid = true;
indexForm->indisready = true;
if (!indexInfo->ii_BrokenHotChain)
indexForm->indcheckxmin = false;
else if (!indexForm->indisvalid || !indexForm->indisready)
indexForm->indcheckxmin = true;
indexForm->indisvalid = true;
indexForm->indisready = true;
simple_heap_update(pg_index, &indexTuple->t_self, indexTuple);
CatalogUpdateIndexes(pg_index, indexTuple);
}