maryannxue commented on a change in pull request #32439:
URL: https://github.com/apache/spark/pull/32439#discussion_r629826756
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -745,7 +754,8 @@ object PushProjectionThroughUnion extends Rule[LogicalPlan]
with PredicateHelper
*/
object ColumnPruning extends Rule[LogicalPlan] {
- def apply(plan: LogicalPlan): LogicalPlan = removeProjectBeforeFilter(plan
transform {
+ def apply(plan: LogicalPlan): LogicalPlan = removeProjectBeforeFilter(
+ plan.transformWithPruning(AlwaysProcess.fn, ruleId) {
Review comment:
I might have missed sth. from the previous commit, but what difference
is there between regular `transform` and
`transformWithPruning(AlwaysProcess.fn, ...)` ?
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