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Don't bother copying empty support arrays in a zero-column MergeJoin.

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The case could not arise when this code was originally written, but it can
now (since we made zero-column MergeJoins work for the benefit of FULL JOIN
ON TRUE).  I don't think there is any actual bug here, but we might as well
treat it consistently with other uses of COPY_POINTER_FIELD().  Per comment
from Ashutosh Bapat.
This commit is contained in:
Tom Lane 2012-04-09 11:41:54 -04:00
parent e969f9a780
commit d515365a61
1 changed files with 7 additions and 4 deletions
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11
src/backend/nodes/copyfuncs.c
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@ -672,10 +672,13 @@ _copyMergeJoin(const MergeJoin *from)
*/
COPY_NODE_FIELD(mergeclauses);
numCols = list_length(from->mergeclauses);
COPY_POINTER_FIELD(mergeFamilies, numCols * sizeof(Oid));
COPY_POINTER_FIELD(mergeCollations, numCols * sizeof(Oid));
COPY_POINTER_FIELD(mergeStrategies, numCols * sizeof(int));
COPY_POINTER_FIELD(mergeNullsFirst, numCols * sizeof(bool));
if (numCols > 0)
{
COPY_POINTER_FIELD(mergeFamilies, numCols * sizeof(Oid));
COPY_POINTER_FIELD(mergeCollations, numCols * sizeof(Oid));
COPY_POINTER_FIELD(mergeStrategies, numCols * sizeof(int));
COPY_POINTER_FIELD(mergeNullsFirst, numCols * sizeof(bool));
}
return newnode;
}