Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/19937#discussion_r155926973
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/SortMergeJoinExec.scala
---
@@ -617,6 +619,7 @@ case class SortMergeJoinExec(
s"""
|while (findNextInnerJoinRows($leftInput, $rightInput)) {
+ | ${leftVarDecl.mkString("\n")}
--- End diff --
I think that the advantage would be to reuse them, avoiding creating and
destroying them at every loop.
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