Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18641#discussion_r127626187
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -273,12 +274,31 @@ case class CaseWhenCodegen(
val cases = branches.map { case (condExpr, valueExpr) =>
val cond = condExpr.genCode(ctx)
val res = valueExpr.genCode(ctx)
+ val (condFunc, condIsNull, condValue) = if ((cond.code.length >=
512) &&
--- End diff --
Is it enough to only consider the generated code of individual condition?
If it is less than 512, e.g, 500, but the combination of all conditions can
still be large to cause the same issue.
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