Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/446#discussion_r11813931
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -146,7 +158,7 @@ case class If(predicate: Expression, trueValue:
Expression, falseValue: Expressi
extends Expression {
def children = predicate :: trueValue :: falseValue :: Nil
- def nullable = trueValue.nullable || falseValue.nullable
+ override def nullable = predicate.nullable || (trueValue.nullable &&
falseValue.nullable)
--- End diff --
I think this was correct before. The nullability of the `predicate` does
not affect the nullability of the output since a null predicate will just cause
the `falseValue` to be output, not null.
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