Github user EntilZha commented on the pull request:
https://github.com/apache/spark/pull/7580#issuecomment-124214142
Based on Hive behavior of this:
```sql
# Returns false
array_contains(array(1, 0), array(1, null)[1])
```
It would seem that this should not use `ExpectsInputTypes` then. My
understanding is that if it were used, then `null` would be implicitly cast to
the `defaultConcretType`. So in the example above, it would be implicitly cast
to `0`, making `array_contains` return `true` instead of `false` as hive does.
This seem correct?
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