Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16238#discussion_r91830324
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -214,6 +228,10 @@ class StreamExecution(
// While active, repeatedly attempt to run batches.
SparkSession.setActiveSession(sparkSession)
+ updateStatusMessage("Initializing sources")
--- End diff --
Could you move `SparkSession.setActiveSession(sparkSession)`,
`updateStatusMessage("Initializing sources")` and `logicalPlan` above
`postEvent(new QueryStartedEvent(id, runId, name))`? Then we can initialize the
logical plan before returning `StreamingQuery` to the user and ensure
`logicalPlan` is always initialized in the stream thread. And you can also add
`assert(Thread.currentThread().isInstanceOf[StreamExecutionThread])` when
creating `logicalPlan`, and remove the unnecessary test you added since this
assertion will be tested in all current stream tests.
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