viirya commented on a change in pull request #29975:
URL: https://github.com/apache/spark/pull/29975#discussion_r502537451
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
##########
@@ -90,8 +90,13 @@ case class SubExprEliminationState(isNull: ExprValue, value:
ExprValue)
* @param codes Strings representing the codes that evaluate common
subexpressions.
* @param states Foreach expression that is participating in subexpression
elimination,
* the state to use.
+ * @param exprCodesNeedEvaluate Some expression codes that need to be evaluate
before
+ * calling common subexpressions.
*/
-case class SubExprCodes(codes: Seq[String], states: Map[Expression,
SubExprEliminationState])
+case class SubExprCodes(
+ codes: Seq[String],
+ states: Map[Expression, SubExprEliminationState],
+ exprCodesNeedEvaluate: Seq[ExprCode])
Review comment:
Yes, this is needed. `ProjectExec` doesn't require all its child's
outputs to be evaluated in advance. Instead it only early evaluates the outputs
used more than twice (deferring evaluation). So we need to extract these
variables used by subexpressions and evaluate them before subexpressions.
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