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Add repalloc0 and repalloc0_array

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These zero out the space added by repalloc.  This is a common pattern
that is quite hairy to code by hand.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/b66dfc89-9365-cb57-4e1f-b7d31813eeec@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2022-11-12 20:31:27 +01:00
parent 30d98e14a8
commit b4b7ce8061
10 changed files with 48 additions and 71 deletions
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8
src/backend/executor/nodeHash.c
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@ -940,12 +940,8 @@ ExecHashIncreaseNumBatches(HashJoinTable hashtable)
else
{
/* enlarge arrays and zero out added entries */
hashtable->innerBatchFile = repalloc_array(hashtable->innerBatchFile, BufFile *, nbatch);
hashtable->outerBatchFile = repalloc_array(hashtable->outerBatchFile, BufFile *, nbatch);
MemSet(hashtable->innerBatchFile + oldnbatch, 0,
(nbatch - oldnbatch) * sizeof(BufFile *));
MemSet(hashtable->outerBatchFile + oldnbatch, 0,
(nbatch - oldnbatch) * sizeof(BufFile *));
hashtable->innerBatchFile = repalloc0_array(hashtable->innerBatchFile, BufFile *, oldnbatch, nbatch);
hashtable->outerBatchFile = repalloc0_array(hashtable->outerBatchFile, BufFile *, oldnbatch, nbatch);
}
MemoryContextSwitchTo(oldcxt);