Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20043#discussion_r158210849
--- 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
+
+object ExprValue {
+ implicit def exprValueToString(exprValue: ExprValue): String =
exprValue.toString
+}
+
+// A literal evaluation of [[ExprCode]].
+case class LiteralValue(val value: String) extends ExprValue {
+ override def toString: String = value
+}
+
+// A variable evaluation of [[ExprCode]].
+case class VariableValue(val variableName: String) extends ExprValue {
+ override def toString: String = variableName
+}
+
+// A statement evaluation of [[ExprCode]].
+case class StatementValue(val statement: String) extends ExprValue {
+ override def toString: String = statement
+}
+
+// A global variable evaluation of [[ExprCode]].
+case class GlobalValue(val value: String) extends ExprValue {
--- End diff --
It is considered as global variable now, as it can be accessed globally and
don't/can't be parameterized.
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