Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/12306#issuecomment-212136305
@davies I have replaced the `NOT IN` code path by a simpler version using a
'NULL-aware' condition. The advantage is that this also works for sub-queries
with nullable columns. The disadvantage is that a `NOT IN` will allmost
certainly use a BNL Join (unless some constraint rewriting magic can eliminate
the OR expressions).
I would like to defer `SEMI JOIN` push down and `SEMI JOIN PLUS` (EXISTENCE
JOIN?) to follow-up PRs.
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