Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19827#discussion_r153234263
--- 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 --
for top level struct, the input is `ctx.INPUT_ROW`, which may be null.
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