Github user jose-torres commented on a diff in the pull request:
https://github.com/apache/spark/pull/20243#discussion_r162132843
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousExecution.scala
---
@@ -54,7 +54,7 @@ class ContinuousExecution(
sparkSession, name, checkpointRoot, analyzedPlan, sink,
trigger, triggerClock, outputMode, deleteCheckpointOnStop) {
- @volatile protected var continuousSources: Seq[ContinuousReader] = _
+ @volatile protected var continuousSources: Seq[ContinuousReader] = Seq()
--- End diff --
Yes. As mentioned in an earlier comment, initializing to null means the
StreamingQueryException won't construct if it happens before sources are set.
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