maropu commented on a change in pull request #25260: [SPARK-28520][SQL]
WholeStageCodegen does not work property for LocalTableScanExec
URL: https://github.com/apache/spark/pull/25260#discussion_r307981271
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
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@@ -895,6 +895,10 @@ case class CollapseCodegenStages(
// domain object can not be written into unsafe row.
case plan if plan.output.length == 1 &&
plan.output.head.dataType.isInstanceOf[ObjectType] =>
plan.withNewChildren(plan.children.map(insertWholeStageCodegen(_,
isColumnar)))
+ case plan: LocalTableScanExec =>
+ // Do not make LogicalTableScanExec the root of WholeStageCodegen
+ // to support the fast driver-local collect/take paths.
+ plan
Review comment:
IIUC LocalTableScan doesn't support codegen in these branches.
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