HeartSaVioR commented on a change in pull request #33038:
URL: https://github.com/apache/spark/pull/33038#discussion_r667571191
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/HDFSBackedStateStoreProvider.scala
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@@ -253,6 +239,12 @@ private[state] class HDFSBackedStateStoreProvider extends
StateStoreProvider wit
this.storeConf = storeConf
this.hadoopConf = hadoopConf
this.numberOfVersionsToRetainInMemory =
storeConf.maxVersionsToRetainInMemory
+
+ require((keySchema.length == 0 && numColsPrefixKey == 0) ||
+ (keySchema.length > numColsPrefixKey), "The number of columns for prefix
key must be " +
+ "greater than the number of columns in the key!")
+ this.numColsPrefixKey = numColsPrefixKey
Review comment:
Nice finding!
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