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Fix GiST index-only scans for opclasses with different storage type.

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We cannot use the index's tuple descriptor directly to describe the index
tuples returned in an index-only scan. That's because the index might use
a different datatype for the values stored on disk than the type originally
indexed. As long as they were both pass-by-ref, it worked, but will not work
for pass-by-value types of different sizes. I noticed this as a crash when I
started hacking a patch to add fetch methods to btree_gist.
This commit is contained in:
Heikki Linnakangas
2015-03-26 23:07:52 +02:00
parent 785941cdc3
commit 55b59eda13
3 changed files with 30 additions and 8 deletions
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2
src/backend/access/gist/gistutil.c
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@@ -657,7 +657,7 @@ gistFetchTuple(GISTSTATE *giststate, Relation r, IndexTuple tuple)
}
MemoryContextSwitchTo(oldcxt);
return index_form_tuple(giststate->tupdesc, fetchatt, isnull);
return index_form_tuple(giststate->fetchTupdesc, fetchatt, isnull);
}
float