[GitHub] [spark] maropu edited a comment on pull request #29085: [SPARK-32106][SQL]Implement SparkScriptTransformationExec in sql/core

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maropu edited a comment on pull request #29085:
URL: https://github.com/apache/spark/pull/29085#issuecomment-662191688


   I meant the behaivour of v3.0.0. Either way, this PR is getting larger, so I think its okay to support it in follow-ups.
   ```
   // v3.0.0
   scala> sql("""
        |   SELECT TRANSFORM(a)
        |   USING 'cat' as output
        |   FROM VALUES (array(1, 2)) t(a)
        | """).show()
   
   ERROR ScriptTransformationWriterThread: Thread-ScriptTransformation-Feed exit cause by: 
   java.lang.ClassCastException: org.apache.spark.sql.catalyst.expressions.UnsafeArrayData cannot be cast to [Ljava.lang.Object;
   	at org.apache.hadoop.hive.serde2.objectinspector.StandardListObjectInspector.getList(StandardListObjectInspector.java:111)
   	at org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.serialize(LazySimpleSerDe.java:299)
   	at org.apache.hadoop.hive.se
   ```


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