Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22270
Thanks for looking into this!
I think we have to clean up our test framework later (after 2.4). We should
identify the test cases that are actually testing the expressions, and run it
with/without enabling the local relation optimization, to test both codegen and
interpreted code paths.
Since the current test suites are a little messy, this will be a lot of
work, to reorganize them. I'm looking forward to seeing us accomplish it in
Spark 3.0!
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