Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/4115#discussion_r23209221
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala
---
@@ -154,8 +154,16 @@ class JoinedRow extends Row {
}
override def toString() = {
- val row = (if (row1 != null) row1 else Seq[Any]()) ++ (if (row2 !=
null) row2 else Seq[Any]())
- s"[${row.mkString(",")}]"
+ // Make sure toString never throws NullPointerException.
+ if ((row1 eq null) && (row2 eq null)) {
+ "[ empty row ]"
+ } else if (row1 eq null) {
+ "[" + row2.mkString(",") + "]"
--- End diff --
Maybe this `row2.mkString("[", ",", "]")`?
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