viirya commented on a change in pull request #32980:
URL: https://github.com/apache/spark/pull/32980#discussion_r660745976
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
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@@ -1049,17 +1103,25 @@ class CodegenContext extends Logging {
// elimination.
val commonExprs = equivalentExpressions.getAllEquivalentExprs(1)
- val nonSplitExprCode = {
+ val nonSplitCode = {
+ val allStates = mutable.ArrayBuffer.empty[SubExprEliminationState]
commonExprs.map { exprs =>
- val eval =
withSubExprEliminationExprs(localSubExprEliminationExprsForNonSplit.toMap) {
+
withSubExprEliminationExprs(localSubExprEliminationExprsForNonSplit.toMap) {
val eval = exprs.head.genCode(this)
- // Generate the code for this expression tree.
- val state = SubExprEliminationState(eval.isNull, eval.value)
+ // Collects other subexpressions from the children.
+ val childrenSubExprs =
mutable.ArrayBuffer.empty[SubExprEliminationState]
+ exprs.head.foreach {
+ case e if subExprEliminationExprs.contains(e) =>
Review comment:
I see. This is not general expression but special (subexpr) ones, so we
don't do collecting child expressions in general but in limited range. Except
that if you have many subexpr and they are highly nested.
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