Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19767
@maropu it partially covers #18641 . One problem is that, for an
expression, if its child generates code less than 1024, and it has many
children, then we still have an issue. `CaseWhen` is a little different because
it at most can have 20 children(depends on
`spark.sql.codegen.maxCaseBranches`). So we can still prevent failures, but may
not be able to JIT.
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