gengliangwang commented on code in PR #39773:
URL: https://github.com/apache/spark/pull/39773#discussion_r1091498423
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveLateralColumnAliasReference.scala:
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@@ -177,8 +195,18 @@ object ResolveLateralColumnAliasReference extends
Rule[LogicalPlan] {
val newAggExprs = collection.mutable.Set.empty[NamedExpression]
val expressionMap =
collection.mutable.LinkedHashMap.empty[Expression, NamedExpression]
- val projectExprs = aggregateExpressions.map { exp =>
- exp.transformDown {
+ // Extract the expressions to keep in the Aggregate. Return the
transformed expression
+ // fully substituted with the attribute reference to the extracted
expressions.
+ def extractExpressions(expr: Expression): Expression = {
+ expr match {
+ case w @ WindowExpression(function, spec) =>
+ // Manually skip the handling on the function itself but
iterate on its children
+ // instead. This is to avoid extracting a window expression's
aggregate functions.
+ // For example, for `sum(sum(col1)) over (..)`, we should
extract sum(col1) but not
Review Comment:
TBH I find this comment confusing... Can you provide more details?
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