Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/3784#issuecomment-68105414
Hi @liancheng, i admit my PR is more complicated, but this only cover three
cases, i think we'd better adding a separate rule to optimize And/Or in sql
for as many as possible cases, not mix several cases in BooleanSimplification.
So I am refactorying my PR to make it more readable and clean.
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