Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6660#discussion_r31791896
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -116,6 +154,41 @@ abstract class BinaryExpression extends Expression
with trees.BinaryNode[Express
override def nullable: Boolean = left.nullable || right.nullable
override def toString: String = s"($left $symbol $right)"
+
+
+ /**
+ * Short hand for generating binary evaluation code, which depends on
two sub-evaluations of
+ * the same type. If either of the sub-expressions is null, the result
of this computation
+ * is assumed to be null.
+ *
+ * @param f a function from two primitive term names to a tree that
evaluates them.
+ */
+ def evaluate(ctx: CodeGenContext,
+ ev: GeneratedExpressionCode,
+ f: (String, String) => String): String = {
+ // TODO: Right now some timestamp tests fail if we enforce this...
+ if (left.dataType != right.dataType) {
+ // log.warn(s"${left.dataType} != ${right.dataType}")
+ }
+
+ val eval1 = left.gen(ctx)
+ val eval2 = right.gen(ctx)
+ val resultCode = f(eval1.primitiveTerm, eval2.primitiveTerm)
+
+ s"""
+ ${eval1.code}
+ boolean ${ev.nullTerm} = ${eval1.nullTerm};
+ ${ctx.primitiveType(dataType)} ${ev.primitiveTerm} =
${ctx.defaultValue(dataType)};
+ if (!${ev.nullTerm}) {
+ ${eval2.code}
+ if(!${eval2.nullTerm}) {
+ ${ev.primitiveTerm} =
(${ctx.primitiveType(dataType)})($resultCode);
--- End diff --
why do we want to cast here? the result code should return the correct time.
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