Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6872#discussion_r33111408
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -221,6 +221,60 @@ private[sql] object BinaryExpression {
def unapply(e: BinaryExpression): Option[(Expression, Expression)] =
Some((e.left, e.right))
}
+abstract class TernaryExpression extends Expression with
trees.TernaryNode[Expression] {
+ self: Product =>
+
+ def symbol: String = sys.error(s"TernaryExpressions must override either
toString or symbol")
+
+ override def foldable: Boolean = first.foldable && second.foldable &&
third.foldable
+
+ override def nullable: Boolean = first.nullable || second.nullable ||
third.nullable
+
+ override def toString: String = s"($symbol ($first, $second, $third))"
+
+ override def isThreadSafe: Boolean = first.isThreadSafe &&
second.isThreadSafe &&
+ third.isThreadSafe
+ /**
+ * Short hand for generating binary evaluation code, which depends on
two sub-evaluations of
+ * the same type. If either of the sub-expressions is null, the result
of this computation
+ * is assumed to be null.
+ *
+ * @param f accepts two variable names and returns Java code to compute
the output.
+ */
+ protected def defineCodeGen(
+ ctx: CodeGenContext,
--- End diff --
Nit: spaces => 2 spaces indent
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