Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
    @@ -396,6 +396,8 @@ case class Or(left: Expression, right: Expression) 
extends BinaryOperator with P
       override def sqlOperator: String = "OR"
    +  override def nullable: Boolean = left.nullable && right.nullable
    --- End diff --
    uh... I did not read the original JIRA. 
    For foldable expressions, we will eventually evaluate them in the 
Optimizer. Maybe, here, we do not need to introduce the extra complexity. 

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