Partial review fixes

Author: gaborgsomogyi

sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala

@@ -2875,14 +2875,15 @@ object SQLConf {
     .stringConf
     .createWithDefault("")
 
-  val DISABLED_STREAMING_UI_CUSTOM_METRICS_LIST =
-    buildConf("spark.sql.streaming.disabledUICustomMetricsList")
+  val DISABLED_STREAMING_UI_CUSTOM_METRIC_LIST =
+    buildConf("spark.sql.streaming.disabledUICustomMetricList")
       .internal()
       .doc("Configures a list of custom metrics on Structured Streaming UI, which are disabled. " +
         "The list contains the name of the custom metrics separated by comma.")
       .version("3.1.0")
       .stringConf
-      .createWithDefault("loadedMapCacheHitCount")
+      .toSequence
+      .createWithDefault(Seq("loadedMapCacheHitCount"))
 
   /**
    * Holds information about keys that have been deprecated.
@@ -3521,9 +3522,6 @@ class SQLConf extends Serializable with Logging {
 
   def disabledJdbcConnectionProviders: String = getConf(SQLConf.DISABLED_JDBC_CONN_PROVIDER_LIST)
 
-  def disabledStreamingCustomMetrics: String =
-    getConf(SQLConf.DISABLED_STREAMING_UI_CUSTOM_METRICS_LIST)
-
   /** ********************** SQLConf functionality methods ************ */
 
   /** Set Spark SQL configuration properties. */

sql/core/src/main/scala/org/apache/spark/sql/streaming/ui/StreamingQueryStatisticsPage.scala

@@ -250,15 +250,17 @@ private[ui] class StreamingQueryStatisticsPage(parent: StreamingQueryTab)
   }
 
   def generateAggregatedCustomMetrics(
-   query: StreamingQueryUIData,
-   minBatchTime: Long,
-   maxBatchTime: Long,
-   jsCollector: JsCollector): NodeBuffer = {
+     query: StreamingQueryUIData,
+     minBatchTime: Long,
+     maxBatchTime: Long,
+     jsCollector: JsCollector): NodeBuffer = {
     val result: NodeBuffer = new NodeBuffer
 
     // This is made sure on caller side but put it here to be defensive
     require(query.lastProgress.stateOperators.nonEmpty)
-    val disabledCustomMetrics = Utils.stringToSeq(SQLConf.get.disabledStreamingCustomMetrics)
+    val disabledCustomMetrics =
+      SQLConf.get.getConf(SQLConf.DISABLED_STREAMING_UI_CUSTOM_METRIC_LIST)
+    logDebug(s"Disabled custom metrics: $disabledCustomMetrics")
     query.lastProgress.stateOperators.head.customMetrics.keySet().asScala
       .filterNot(disabledCustomMetrics.contains(_)).map { metricName =>
         val data = query.recentProgress.map(p => (parseProgressTimestamp(p.timestamp),