sahnib commented on code in PR #44961:
URL: https://github.com/apache/spark/pull/44961#discussion_r1489753708


##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/HDFSBackedStateStoreProvider.scala:
##########
@@ -94,6 +94,10 @@ private[sql] class HDFSBackedStateStoreProvider extends 
StateStoreProvider with
       Iterator[UnsafeRowPair] = {
       map.prefixScan(prefixKey)
     }
+
+    override def valuesIterator(key: UnsafeRow, colFamilyName: String): 
Iterator[UnsafeRow] = {
+      throw new UnsupportedOperationException("store does not support multiple 
values per key")

Review Comment:
   Fixed. 



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