Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11618#issuecomment-195497597
sounds good, thank you. In my branch, I try to address (2) by not adding
new conditions if the child node(s) already have the given constraint. For (3),
please note that pushing `b = c` down isn't useless if `a` comes from the left
side of the join and `b` and `c` come from the right. It is of course useless
if `b` and `c` come from different sides of the join. I think we can have a
slightly smarter filter inference rule for joins to identify the latter.
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