Github user vkorukanti commented on the pull request:
https://github.com/apache/drill/pull/462#issuecomment-210056992
I haven't tried this, but wondering whether this is sufficient to handle
mix of EQUALS and IS NOT DISTINCT FROM cases. Maintain a list (one for each
join condition) instead of single "areNullsEquals" flag in MergeJoinBatch [1]
and ChainedHashTable [2] and generate the code accordingly for each condition.
[1]
https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/join/MergeJoinBatch.java#L463
[2]
https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/common/ChainedHashTable.java#L251
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