Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/6165#discussion_r30837623
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/columnar/InMemoryColumnarTableScan.scala
---
@@ -314,7 +314,7 @@ private[sql] case class InMemoryColumnarTableScan(
columnAccessors(i).extractTo(nextRow, i)
i += 1
}
- nextRow
+ if (attributes.isEmpty) Row.empty else nextRow
--- End diff --
We need at least one column so that we know how many rows to produce, but
we should not include it in the output otherwise we will not match the schema
we are claiming to have. It would be better to just remember the number of
rows in a partition and use that instead. This is just a quick fix so we don't
return the wrong answer.
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