Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19568#discussion_r146756914
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/SortMergeJoinExec.scala
---
@@ -585,21 +585,26 @@ case class SortMergeJoinExec(
val iterator = ctx.freshName("iterator")
val numOutput = metricTerm(ctx, "numOutputRows")
+ val joinedRow = ctx.freshName("joined")
--- End diff --
I think we only need to do this when there is `CodegenFallback` in the
condition expressions.
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