[GitHub] [spark] HyukjinKwon commented on a diff in pull request #37905: [SPARK-40460][SS] Fix streaming metrics when selecting `_metadata`

[GitBox]

HyukjinKwon commented on code in PR #37905:
URL: https://github.com/apache/spark/pull/37905#discussion_r972848982


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sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/MicroBatchExecution.scala:
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@@ -553,7 +554,7 @@ class MicroBatchExecution(
     logDebug(s"Running batch $currentBatchId")
 
     // Request unprocessed data from all sources.
-    newData = reportTimeTaken("getBatch") {
+    val mutableNewData = mutable.Map() ++ reportTimeTaken("getBatch") {

Review Comment:
   ```suggestion
       val mutableNewData = mutable.Map.empty ++ reportTimeTaken("getBatch") {
   ```



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