Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19827#discussion_r153385444
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateUnsafeProjection.scala
---
@@ -167,9 +160,20 @@ object GenerateUnsafeProjection extends
CodeGenerator[Seq[Expression], UnsafePro
}
}
+ val writeFieldsCode = if (isTopLevel && row == null) {
--- End diff --
The `INPUT_ROW` of this local codegen context is not changed in
`GenerateUnsafeProjection`. If it is `null`, the generated code will become:
```scala
class SpecificUnsafeProjection extends ${classOf[UnsafeProjection].getName}
{
...
public UnsafeRow apply(InternalRow null) { // InternalRow
${ctx.INPUT_ROW} here.
${eval.code.trim}
return ${eval.value};
}
...
}
```
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