jerrypeng commented on code in PR #52620:
URL: https://github.com/apache/spark/pull/52620#discussion_r2461836339
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/runtime/MicroBatchExecution.scala:
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@@ -263,6 +290,12 @@ class MicroBatchExecution(
case s => s -> ReadLimit.allAvailable()
}.toMap
}
+ if (trigger.isInstanceOf[RealTimeTrigger] && uniqueSources.size !=
sources.size) {
+ throw new SparkIllegalStateException(
+ errorClass =
s"STREAMING_REAL_TIME_MODE.IDENTICAL_SOURCES_IN_UNION_NOT_SUPPORTED",
Review Comment:
There are only two types of operators that can have more than 1 streaming
source for streaming queries. It is union and stream-stream join.
Stream-stream join is not going to be supported for now because it is a
stateful operator ( I will have a upcoming PR that checks for this). Thus,
union is currently the only operator in which this condition can occur for.
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