Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18818#discussion_r132002008
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -453,6 +453,14 @@ case class Or(left: Expression, right: Expression)
extends BinaryOperator with P
abstract class BinaryComparison extends BinaryOperator with Predicate {
+ override def inputType: AbstractDataType = AnyDataType
--- End diff --
We have to write the code comments for explaining it. Given this
assumption, `inputType` might be misused in the future.
In addition, this PR has a pretty critical change. We really need to check
all the new data types we support in this PR.
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ordering.scala#L90-L97
Could you write a comprehensive test case coverage for this?
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