Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/18641#discussion_r128309465
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -273,12 +274,26 @@ case class CaseWhenCodegen(
val cases = branches.map { case (condExpr, valueExpr) =>
val cond = condExpr.genCode(ctx)
val res = valueExpr.genCode(ctx)
+ val (condFunc, condIsNull, condValue, resFunc, resIsNull, resValue )
=
+ if ((cond.code.length + res.code.length) > 1024 &&
--- End diff --
@viirya I worked for possible three cases that may break 64KB limit.
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