Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19800#discussion_r152844926
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateOrdering.scala
---
@@ -149,10 +151,14 @@ object GenerateOrdering extends
CodeGenerator[Seq[SortOrder], Ordering[InternalR
})
// make sure INPUT_ROW is declared even if splitExpressions
// returns an inlined block
- s"""
+ val finalCode = s"""
|InternalRow ${ctx.INPUT_ROW} = null;
|$code
""".stripMargin
+ // Restore original currentVars and INPUT_ROW.
+ ctx.currentVars = oldCurrentVars
+ ctx.INPUT_ROW = oldInputRow
+ finalCode
--- End diff --
```
ctx.currentVars = oldCurrentVars
ctx.INPUT_ROW = oldInputRow
s"""
|InternalRow $inputRow = null;
|$code
""".stripMargin
```
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