Github user LosD commented on the pull request:
https://github.com/apache/metamodel/pull/75#issuecomment-162516676
I realize we are for much more than SQL, but the null comparisons being
equal worries me a bit, "NULL is never equal to anything" is a pretty
important part of SQL (and maybe one of the few things all SQL vendors can
agree on).
OTOH, NULL is never NOT equal to anything else, so this may still be wrong
SQL-wise.
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