Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18346
Sorry I'm taking this off, `CodegenFallback` may be not needed, but we do
need the interpreted evaluation of expressions, see
https://issues.apache.org/jira/browse/SPARK-21320 .
So to fix this problem, we should make all expressions support interpreted
evaluation, instead of making all expressions support codegen.
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