Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19568
@rdblue Yes, the current implementation implicitly assumes the rule
`CollapseCodegenStages ` excludes all the illegal cases. How about adding an
`assert` to do the check that the condition of `SortMergeJoinExec` does not
have `CodegenFallback ` expressions? Also write a code comment to explain
`CollapseCodegenStages ` guarantees the assumption?
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