zml1206 commented on code in PR #49202:
URL: https://github.com/apache/spark/pull/49202#discussion_r1906555390
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteWithExpression.scala:
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@@ -90,7 +90,17 @@ object RewriteWithExpression extends Rule[LogicalPlan] {
// the current operator may have extra columns if it inherits the output
columns from its
// child, and we need to project away the extra columns to keep the plan
schema unchanged.
assert(p.output.length <= newPlan.output.length)
- if (p.output.length < newPlan.output.length) {
+ newPlan.output.diff(p.output).forall(_.name.startsWith("_"))
Review Comment:
The redundant ones will be deleted later.
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