uncleGen commented on a change in pull request #26201: [SPARK-29543][SS][UI] 
Init structured streaming ui
URL: https://github.com/apache/spark/pull/26201#discussion_r337825837
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/internal/SharedState.scala
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 @@ -110,6 +111,11 @@ private[sql] class SharedState(
    */
   val cacheManager: CacheManager = new CacheManager
 
+  /**
+   * Class for caching streaming query instance.
+   */
+  val streamingQueryCache = new mutable.HashSet[(StreamingQuery, Long)]
 
 Review comment:
   make sense

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