Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17450#discussion_r108837093
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -297,8 +297,8 @@ case class Lower(child: Expression) extends
UnaryExpression with String2StringEx
}
/** A base trait for functions that compare two strings, returning a
boolean. */
-trait StringPredicate extends Predicate with ImplicitCastInputTypes {
- self: BinaryExpression =>
+abstract class StringPredicate extends BinaryExpression
+ with Predicate with ImplicitCastInputTypes {
--- End diff --
I finally got your point. `StringPredicate` is used for inferring the null
constants in the rule `NullPropagation`. Thus, we should mark it as
`NullIntolerant `.
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