cloud-fan commented on code in PR #48395:
URL: https://github.com/apache/spark/pull/48395#discussion_r1796369501
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala:
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@@ -260,19 +260,32 @@ object ReorderAssociativeOperator extends
Rule[LogicalPlan] {
q.transformExpressionsDownWithPruning(_.containsPattern(BINARY_ARITHMETIC)) {
case a @ Add(_, _, f) if a.deterministic &&
a.dataType.isInstanceOf[IntegralType] =>
val (foldables, others) = flattenAdd(a,
groupingExpressionSet).partition(_.foldable)
- if (foldables.size > 1) {
+ if (foldables.nonEmpty) {
val foldableExpr = foldables.reduce((x, y) => Add(x, y, f))
- val c = Literal.create(foldableExpr.eval(EmptyRow), a.dataType)
- if (others.isEmpty) c else Add(others.reduce((x, y) => Add(x, y,
f)), c, f)
+ val foldableValue = foldableExpr.eval(EmptyRow)
+ if (others.isEmpty) {
+ Literal.create(foldableValue, a.dataType)
+ } else if (foldableValue == 0) {
Review Comment:
do we need to consider the NULL semantic? NULL + 0 results to NULL, not 0
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