Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9385#issuecomment-154640515
`Expression` instances have two different kinds of equality:
- `equals` full equality, i.e. capitalization, qualifiers, etc. This is
important for example to know if a tree transformation has reached fixed point.
- `semanticEquals` equivalent in execution (i.e. will return the same
result)
If you ran into problems adding qualifiers to `equals` then I think it is
likely that that code should actually be using `semanticEquals`.
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