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Posted to reviews@spark.apache.org by "ueshin (via GitHub)" <gi...@apache.org> on 2023/07/26 21:51:50 UTC

[GitHub] [spark] ueshin opened a new pull request, #42176: [SPARK-44479][PYTHON][3.5] Fix ArrowStreamPandasUDFSerializer to accept no-column pandas DataFrame

ueshin opened a new pull request, #42176:
URL: https://github.com/apache/spark/pull/42176

   ### What changes were proposed in this pull request?
   
   Fixes `ArrowStreamPandasUDFSerializer` to accept no-column pandas DataFrame.
   
   ```py
   >>> def _scalar_f(id):
   ...   return pd.DataFrame(index=id)
   ...
   >>> scalar_f = pandas_udf(_scalar_f, returnType=StructType())
   >>> df = spark.range(3).withColumn("f", scalar_f(col("id")))
   >>> df.printSchema()
   root
    |-- id: long (nullable = false)
    |-- f: struct (nullable = true)
   
   >>> df.show()
   +---+---+
   | id|  f|
   +---+---+
   |  0| {}|
   |  1| {}|
   |  2| {}|
   +---+---+
   ```
   
   ### Why are the changes needed?
   
   The above query fails with the following error:
   
   ```py
   >>> df.show()
   org.apache.spark.api.python.PythonException: Traceback (most recent call last):
   ...
   ValueError: not enough values to unpack (expected 2, got 0)
   ```
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, Pandas UDF will accept no-column pandas DataFrame.
   
   ### How was this patch tested?
   
   Added related tests.


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[GitHub] [spark] ueshin commented on pull request #42176: [SPARK-44479][PYTHON][3.5] Fix ArrowStreamPandasUDFSerializer to accept no-column pandas DataFrame

Posted by "ueshin (via GitHub)" <gi...@apache.org>.
ueshin commented on PR #42176:
URL: https://github.com/apache/spark/pull/42176#issuecomment-1652752178

   Thanks! merging to 3.5.


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[GitHub] [spark] ueshin closed pull request #42176: [SPARK-44479][PYTHON][3.5] Fix ArrowStreamPandasUDFSerializer to accept no-column pandas DataFrame

Posted by "ueshin (via GitHub)" <gi...@apache.org>.
ueshin closed pull request #42176: [SPARK-44479][PYTHON][3.5] Fix ArrowStreamPandasUDFSerializer to accept no-column pandas DataFrame
URL: https://github.com/apache/spark/pull/42176


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