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https://issues.apache.org/jira/browse/SPARK-56189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yicong Huang resolved SPARK-56189.
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Resolution: Duplicate
> Refactor SQL_GROUPED_AGG_ARROW_UDF and SQL_GROUPED_AGG_ARROW_ITER_UDF to use
> ArrowStreamSerializer
> --------------------------------------------------------------------------------------------------
>
> Key: SPARK-56189
> URL: https://issues.apache.org/jira/browse/SPARK-56189
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark, SQL
> Affects Versions: 4.2.0
> Reporter: Yicong Huang
> Priority: Major
>
> Move the processing logic for SQL_GROUPED_AGG_ARROW_UDF and
> SQL_GROUPED_AGG_ARROW_ITER_UDF out of ArrowStreamAggArrowUDFSerializer and
> into read_udfs() in worker.py, using ArrowStreamSerializer as a pure I/O
> layer.
> This is part of the incremental serializer refactor (SPARK-55388). The change:
> - Deletes wrap_grouped_agg_arrow_udf() and wrap_grouped_agg_arrow_iter_udf()
> wrapper functions
> - Returns raw (func, args_offsets, kwargs_offsets, return_type) from
> read_single_udf()
> - Adds self-contained processing blocks in read_udfs() that handle grouped
> input, UDF invocation, and output coercion
> - Replaces ArrowStreamAggArrowUDFSerializer with
> ArrowStreamSerializer(write_start_stream=True, num_dfs=1)
> - Fixes a latent infinite recursion bug in _load_group_dataframes when
> num_dfs != 0 by extracting _read_arrow_stream()
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