Github user viirya 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 --
    Actually the current `def nullable: Boolean = left.nullable || 
right.nullable` for `Or` is not very accurate too.
    At least when any of left/right is true, its `nullable` should be false.
    Although we can't know if any of left/right is true under most of cases, 
but if they are foldable, then we can know that.
    @gatorsmile @hvanhovell What do you think?

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