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### What changes were proposed in this pull request? This PR proposes to move pandas related functionalities into pandas package. Namely: ```bash pyspark/sql/pandas ├── __init__.py ├── conversion.py # Conversion between pandas <> PySpark DataFrames ├── functions.py # pandas_udf ├── group_ops.py # Grouped UDF / Cogrouped UDF + groupby.apply, groupby.cogroup.apply ├── map_ops.py # Map Iter UDF + mapInPandas ├── serializers.py # pandas <> PyArrow serializers ├── types.py # Type utils between pandas <> PyArrow └── utils.py # Version requirement checks ``` In order to separately locate `groupby.apply`, `groupby.cogroup.apply`, `mapInPandas`, `toPandas`, and `createDataFrame(pdf)` under `pandas` sub-package, I had to use a mix-in approach which Scala side uses often by `trait`, and also pandas itself uses this approach (see `IndexOpsMixin` as an example) to group related functionalities. Currently, you can think it's like Scala's self typed trait. See the structure below: ```python class PandasMapOpsMixin(object): def mapInPandas(self, ...): ... return ... # other Pandas <> PySpark APIs ``` ```python class DataFrame(PandasMapOpsMixin): # other DataFrame APIs equivalent to Scala side. ``` Yes, This is a big PR but they are mostly just moving around except one case `createDataFrame` which I had to split the methods. ### Why are the changes needed? There are pandas functionalities here and there and I myself gets lost where it was. Also, when you have to make a change commonly for all of pandas related features, it's almost impossible now. Also, after this change, `DataFrame` and `SparkSession` become more consistent with Scala side since pandas is specific to Python, and this change separates pandas-specific APIs away from `DataFrame` or `SparkSession`. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Existing tests should cover. Also, I manually built the PySpark API documentation and checked. Closes #27109 from HyukjinKwon/pandas-refactoring. Authored-by: HyukjinKwon <gurwls223@apache.org> Signed-off-by: HyukjinKwon <gurwls223@apache.org> |
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__init__.py | ||
mllibutils.py | ||
mlutils.py | ||
sqlutils.py | ||
streamingutils.py | ||
utils.py |