Hyukjin Kwon created SPARK-61034:
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             Summary: Send the output schema of transformWithState in the 
Python client as PySpark does
                 Key: SPARK-61034
                 URL: https://issues.apache.org/jira/browse/SPARK-61034
             Project: Spark
          Issue Type: Bug
          Components: Connect
    Affects Versions: connect-rust-4.3.0
            Reporter: Hyukjin Kwon


In PySpark Connect, {{df.groupBy(...).transformWithState(statefulProcessor, 
outputStructType, outputMode, timeMode)}} sends {{outputStructType}} as the 
{{output_schema}} of the {{TransformWithStateInfo}} of its {{GroupMap}}, as 
{{transformWithStateInPandas}} does. The server reads it as the schema of the 
output rows.

The Rust-backed Python client, and the Rust API 
{{GroupedData::transform_with_state}}, send no output schema for 
{{transformWithState}}. So the server fails to analyze the DataFrame with 
{{[CONNECT_INVALID_PLAN.DATA_TYPE_UNSUPPORTED_PROTO_TO_CATALYST] The Spark 
Connect plan is invalid. Does not support convert KIND_NOT_SET to catalyst 
types.}} Send it as PySpark does.




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