Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20043#discussion_r158361417
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -56,7 +56,36 @@ import org.apache.spark.util.{ParentClassLoader, Utils}
* @param value A term for a (possibly primitive) value of the result of
the evaluation. Not
* valid if `isNull` is set to `true`.
*/
-case class ExprCode(var code: String, var isNull: String, var value:
String)
+case class ExprCode(var code: String, var isNull: ExprValue, var value:
ExprValue)
+
+
+// An abstraction that represents the evaluation result of [[ExprCode]].
+abstract class ExprValue
--- End diff --
IMHO I prefer this approach because in the future we might need to
distinguish these two cases, thus I think is a good thing to let them be
distinct.
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