Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/10563#issuecomment-171513310
Says we have 2 tables src1(a Int, b Int), src2(a Int, b Int), and both of
the tables rows are
`(null, null)`
When we do the query like `select * from src1 anti join src2 on
src1.a>src2.a`, I think the expected output should be empty, but we will get
`(null, null)` as the join condition returns `null` (as the `null` will be
casted to `false` if we don't change the return type for `predicate`).
`Semi join` is definitely will not fall in the category, as it always
filter the rows with the join condition result be `true` (`null` or `false` is
not a problem for it).
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