Github user joseph-torres commented on a diff in the pull request:
https://github.com/apache/spark/pull/19452#discussion_r144440844
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinExec.scala
---
@@ -161,6 +164,10 @@ case class StreamingSymmetricHashJoinExec(
new SerializableConfiguration(SessionState.newHadoopConf(
sparkContext.hadoopConfiguration, sqlContext.conf)))
+
+ val nullLeft = new
GenericInternalRow(left.output.map(_.withNullability(true)).length)
+ val nullRight = new
GenericInternalRow(right.output.map(_.withNullability(true)).length)
--- End diff --
The problem is that the left joiner has left input attributes, but needs
the right null row.
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