Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19813#discussion_r156056362
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -105,6 +105,11 @@ abstract class Expression extends TreeNode[Expression]
{
val isNull = ctx.freshName("isNull")
val value = ctx.freshName("value")
val eval = doGenCode(ctx, ExprCode("", isNull, value))
+
+ // Records current input row and variables of this expression.
+ eval.inputRow = ctx.INPUT_ROW
+ eval.inputVars = findInputVars(ctx, eval)
--- End diff --
shall we do one more thing here?
```
eval.isNull = if (this.nullable) eval.isNull else "false"
```
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