[GitHub] [spark] dongjoon-hyun commented on pull request #31656: [SPARK-34548][SQL] Remove unnecessary children from Union under Distince and Deduplicate

[GitBox <gi...@apache.org>]

dongjoon-hyun commented on pull request #31656:
URL: https://github.com/apache/spark/pull/31656#issuecomment-789353959


   Hi, All.
   This seems to break Scala 2.13 build. Please see the master branch and the last commit on this PR.
   
   ```
   [error] /home/runner/work/spark/spark/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:550:25: type mismatch;
   1040
   [error]  found   : scala.collection.mutable.ArrayBuffer[org.apache.spark.sql.catalyst.plans.logical.LogicalPlan]
   1041
   [error]  required: Seq[org.apache.spark.sql.catalyst.plans.logical.LogicalPlan]
   1042
   [error]       u.copy(children = uniqueChildren)
   1043
   [error]                         ^
   1044
   [error] one error found
   1045
   [error] (catalyst / Compile / compileIncremental) Compilation failed
   1046
   [error] Total time: 177 s (02:57), completed Mar 3, 2021 1:24:01 AM
   1047
   ```


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