[SPARK-58157][PYTHON] Remove TransformWithStateInPySparkRowInitStateSerializer#57438
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…erializer ### What changes were proposed in this pull request? Delete `TransformWithStateInPySparkRowInitStateSerializer` from `python/pyspark/sql/pandas/serializers.py`. Its init-state deserialization logic was moved into `read_udfs()` in `worker.py` by [SPARK-58191](https://issues.apache.org/jira/browse/SPARK-58191) (#57337), which switched `SQL_TRANSFORM_WITH_STATE_PYTHON_ROW_INIT_STATE_UDF` to use the plain `ArrowStreamSerializer` for pure Arrow stream I/O. The class is no longer referenced by any eval type. A benchmark comment in `bench_eval_type.py` that attributed the row-by-row walk to this class is updated to point at `read_udfs()`. Part of [SPARK-55384](https://issues.apache.org/jira/browse/SPARK-55384). ### Why are the changes needed? The class is dead code after the refactor in SPARK-58191. Removing it keeps serializers as pure I/O and avoids a stale, unused class. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Existing tests. This is a dead-code deletion with no remaining references (verified repo-wide, including dynamic lookups); behavior is unchanged since the eval type already runs through `read_udfs()`. ### Was this patch authored or co-authored using generative AI tooling? No. Closes #57438 from Yicong-Huang/SPARK-58157. Authored-by: Yicong Huang <17627829+Yicong-Huang@users.noreply.github.com> Signed-off-by: Uros Bojanic <221401595+uros-b@users.noreply.github.com> (cherry picked from commit 93c3367) Signed-off-by: Uros Bojanic <221401595+uros-b@users.noreply.github.com>
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What changes were proposed in this pull request?
Delete
TransformWithStateInPySparkRowInitStateSerializerfrompython/pyspark/sql/pandas/serializers.py. Its init-state deserialization logic was moved intoread_udfs()inworker.pyby SPARK-58191 (#57337), which switchedSQL_TRANSFORM_WITH_STATE_PYTHON_ROW_INIT_STATE_UDFto use the plainArrowStreamSerializerfor pure Arrow stream I/O. The class is no longer referenced by any eval type. A benchmark comment inbench_eval_type.pythat attributed the row-by-row walk to this class is updated to point atread_udfs().Part of SPARK-55384.
Why are the changes needed?
The class is dead code after the refactor in SPARK-58191. Removing it keeps serializers as pure I/O and avoids a stale, unused class.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Existing tests. This is a dead-code deletion with no remaining references (verified repo-wide, including dynamic lookups); behavior is unchanged since the eval type already runs through
read_udfs().Was this patch authored or co-authored using generative AI tooling?
No.