Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18931#discussion_r136742515
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/ExpandExec.scala ---
@@ -89,6 +89,8 @@ case class ExpandExec(
child.asInstanceOf[CodegenSupport].inputRDDs()
}
+ override protected def doConsumeInChainOfFunc: Boolean = false
--- End diff --
The `doConsume` produces something like:
|for (int $i = 0; $i < ${projections.length}; $i ++) {
| switch ($i) {
| ${cases.mkString("\n").trim}
| }
| $numOutput.add(1);
| ${consume(ctx, outputColumns)}
|}
So the consume logic of its parent node is actually wrapped in a local
for-loop. It has the same effect as not chain the next consume.
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