HeartSaVioR commented on a change in pull request #33038:
URL: https://github.com/apache/spark/pull/33038#discussion_r661889937
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/HDFSBackedStateStoreProvider.scala
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@@ -252,6 +238,12 @@ private[state] class HDFSBackedStateStoreProvider extends
StateStoreProvider wit
this.storeConf = storeConf
this.hadoopConf = hadoopConf
this.numberOfVersionsToRetainInMemory =
storeConf.maxVersionsToRetainInMemory
+
+ require((keySchema.length == 0 && numColsPrefixKey == 0) ||
Review comment:
Passing empty key schema is possible via groupBy with no column - I also
noticed this in existing UT.
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