Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21403
I agree with the proposed behavior, but I'm a little worried about hacking
the existig `In` expression to implement it.
I took a look at postgres, `a = b` is equal to `a.i = b.i and a.j = b.j` if
`a` and `b` are both struct type with same number of fields with same type. If
we make Spark's equal operator follow this semantic, it can make this PR
simpler.
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