juliuszsompolski commented on PR #42465:
URL: https://github.com/apache/spark/pull/42465#issuecomment-1675572707

   It looks like maybe it's making the incremental build confused?
   Even if I don't change anything I get:
   ```
   [success] Total time: 176 s (02:56), completed Aug 12, 2023 12:35:16 AM
   sbt:spark-connect> testOnly *SparkConnectReattachableExecuteSuite
   [info] compiling 13 Scala sources to 
/home/julek/spark-apache/sql/api/target/scala-2.12/classes ...
   [info] compiling 39 Scala sources to 
/home/julek/spark-apache/core/target/scala-2.12/classes ...
   [info] compiling 1 Scala source to 
/home/julek/spark-apache/connector/connect/common/target/scala-2.12/classes ...
   [info] compiling 5 Scala sources to 
/home/julek/spark-apache/connector/connect/client/jvm/target/scala-2.12/classes 
...
   [warn] multiple main classes detected: run 'show discoveredMainClasses' to 
see the list
   [info] compiling 8 Scala sources to 
/home/julek/spark-apache/streaming/target/scala-2.12/classes ...
   [info] compiling 32 Scala sources to 
/home/julek/spark-apache/core/target/scala-2.12/test-classes ...
   [info] compiling 41 Scala sources to 
/home/julek/spark-apache/sql/catalyst/target/scala-2.12/classes ...
   [warn] multiple main classes detected: run 'show discoveredMainClasses' to 
see the list
   [info] compiling 25 Scala sources to 
/home/julek/spark-apache/sql/core/target/scala-2.12/classes ...
   [info] compiling 1 Scala source to 
/home/julek/spark-apache/connector/avro/target/scala-2.12/classes ...
   [info] compiling 1 Scala source to 
/home/julek/spark-apache/mllib/target/scala-2.12/classes ...
   [warn] multiple main classes detected: run 'show discoveredMainClasses' to 
see the list
   [info] compiling 2 Scala sources to 
/home/julek/spark-apache/connector/connect/server/target/scala-2.12/classes ...
   [warn] multiple main classes detected: run 'show discoveredMainClasses' to 
see the list
   [info] compiling 56 Scala sources to 
/home/julek/spark-apache/sql/catalyst/target/scala-2.12/test-classes ...
   [info] compiling 227 Scala sources to 
/home/julek/spark-apache/sql/core/target/scala-2.12/test-classes ...
   [info] compiling 3 Scala sources to 
/home/julek/spark-apache/connector/connect/server/target/scala-2.12/test-classes
 ...
   [info] SparkConnectReattachableExecuteSuite:
   ```
   with 2-3 minutes of recompiling.
   Maybe the conflicting artifacts from spark-sql and spark-connect-client-jvm 
mix in a way that makes the build system confused that there were modifications?


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