FEAT-#6831: Implement read_parquet_glob and to_parquet_glob

docs/flow/modin/experimental/pandas.rst

@@ -13,4 +13,6 @@ Experimental API Reference
 .. autofunction:: read_csv_glob
 .. autofunction:: read_custom_text
 .. autofunction:: read_pickle_distributed
+.. autofunction:: read_parquet_glob
 .. automethod:: modin.pandas.DataFrame.modin::to_pickle_distributed
+.. automethod:: modin.pandas.DataFrame.modin::to_parquet_glob

docs/supported_apis/dataframe_supported.rst

@@ -421,6 +421,8 @@ default to pandas.
 |                            |                           |                        | ``path`` parameter specifies a directory where one |
 |                            |                           |                        | file is written per row partition of the Modin     |
 |                            |                           |                        | dataframe.                                         |
+|                            |                           |                        | Experimental implementation:                       |
+|                            |                           |                        | DataFrame.modin.to_parquet_glob                    |
 +----------------------------+---------------------------+------------------------+----------------------------------------------------+
 | ``to_period``              | `to_period`_              | D                      |                                                    |
 +----------------------------+---------------------------+------------------------+----------------------------------------------------+

docs/supported_apis/io_supported.rst

@@ -46,6 +46,7 @@ default to pandas.
 |                   |                                 | passed via ``**kwargs`` are not supported.             |
 |                   |                                 | ``use_nullable_dtypes`` == True is not supported.      |
 |                   |                                 |                                                        |
+|                   |                                 | Experimental implementation: read_parquet_glob         |
 +-------------------+---------------------------------+--------------------------------------------------------+
 | `read_json`_      | P                               | Implemented for ``lines=True``                         |
 +-------------------+---------------------------------+--------------------------------------------------------+

docs/usage_guide/advanced_usage/index.rst

@@ -30,8 +30,10 @@ Modin also supports these experimental APIs on top of pandas that are under acti
 - :py:func:`~modin.experimental.pandas.read_csv_glob` -- read multiple files in a directory
 - :py:func:`~modin.experimental.pandas.read_sql` -- add optional parameters for the database connection
 - :py:func:`~modin.experimental.pandas.read_custom_text` -- read custom text data from file
-- :py:func:`~modin.experimental.pandas.read_pickle_distributed`  -- read multiple files in a directory
-- :py:meth:`~modin.pandas.DataFrame.modin.to_pickle_distributed` -- write to multiple files in a directory
+- :py:func:`~modin.experimental.pandas.read_pickle_distributed`  -- read multiple pickle files in a directory
+- :py:func:`~modin.experimental.pandas.read_parquet_glob`  -- read multiple parquet files in a directory
+- :py:meth:`~modin.pandas.DataFrame.modin.to_pickle_distributed` -- write to multiple pickle files in a directory
+- :py:meth:`~modin.pandas.DataFrame.modin.to_parquet_glob` -- write to multiple parquet files in a directory
 
 DataFrame partitioning API
 --------------------------

modin/core/execution/dask/implementations/pandas_on_dask/io/io.py

@@ -43,12 +43,13 @@
 from modin.experimental.core.io import (
     ExperimentalCSVGlobDispatcher,
     ExperimentalCustomTextDispatcher,
-    ExperimentalPickleDispatcher,
+    ExperimentalGlobDispatcher,
     ExperimentalSQLDispatcher,
 )
 from modin.experimental.core.storage_formats.pandas.parsers import (
     ExperimentalCustomTextParser,
     ExperimentalPandasCSVGlobParser,
+    ExperimentalPandasParquetParser,
     ExperimentalPandasPickleParser,
 )
 
@@ -89,10 +90,20 @@ def __make_write(*classes, build_args=build_args):
     read_csv_glob = __make_read(
         ExperimentalPandasCSVGlobParser, ExperimentalCSVGlobDispatcher
     )
+    read_parquet_glob = __make_read(
+        ExperimentalPandasParquetParser, ExperimentalGlobDispatcher
+    )
+    to_parquet_glob = __make_write(
+        ExperimentalGlobDispatcher,
+        build_args={**build_args, "base_write": BaseIO.to_parquet},
+    )
     read_pickle_distributed = __make_read(
-        ExperimentalPandasPickleParser, ExperimentalPickleDispatcher
+        ExperimentalPandasPickleParser, ExperimentalGlobDispatcher
+    )
+    to_pickle_distributed = __make_write(
+        ExperimentalGlobDispatcher,
+        build_args={**build_args, "base_write": BaseIO.to_pickle},
     )
-    to_pickle_distributed = __make_write(ExperimentalPickleDispatcher)
     read_custom_text = __make_read(
         ExperimentalCustomTextParser, ExperimentalCustomTextDispatcher
     )

modin/core/execution/dispatching/factories/dispatcher.py

@@ -296,6 +296,16 @@ def to_pickle(cls, *args, **kwargs):
     def to_pickle_distributed(cls, *args, **kwargs):
         return cls.get_factory()._to_pickle_distributed(*args, **kwargs)
 
+    @classmethod
+    @_inherit_docstrings(factories.PandasOnRayFactory._read_parquet_glob)
+    def read_parquet_glob(cls, *args, **kwargs):
+        return cls.get_factory()._read_parquet_glob(*args, **kwargs)
+
+    @classmethod
+    @_inherit_docstrings(factories.PandasOnRayFactory._to_parquet_glob)
+    def to_parquet_glob(cls, *args, **kwargs):
+        return cls.get_factory()._to_parquet_glob(*args, **kwargs)
+
     @classmethod
     @_inherit_docstrings(factories.PandasOnRayFactory._read_custom_text)
     def read_custom_text(cls, **kwargs):

modin/core/execution/dispatching/factories/factories.py

@@ -516,6 +516,39 @@ def _to_pickle_distributed(cls, *args, **kwargs):
             )
         return cls.io_cls.to_pickle_distributed(*args, **kwargs)
 
+    @classmethod
+    @doc(
+        _doc_io_method_raw_template,
+        source="Parquet files",
+        params=_doc_io_method_kwargs_params,
+    )
+    def _read_parquet_glob(cls, **kwargs):
+        current_execution = get_current_execution()
+        if current_execution not in supported_executions:
+            raise NotImplementedError(
+                f"`_read_parquet_glob()` is not implemented for {current_execution} execution."
+            )
+        return cls.io_cls.read_parquet_glob(**kwargs)
+
+    @classmethod
+    def _to_parquet_glob(cls, *args, **kwargs):
+        """
+        Write query compiler content to several parquet files.
+
+        Parameters
+        ----------
+        *args : args
+            Arguments to pass to the writer method.
+        **kwargs : kwargs
+            Arguments to pass to the writer method.
+        """
+        current_execution = get_current_execution()
+        if current_execution not in supported_executions:
+            raise NotImplementedError(
+                f"`_to_parquet_glob()` is not implemented for {current_execution} execution."
+            )
+        return cls.io_cls.to_parquet_glob(*args, **kwargs)
+
 
 @doc(_doc_factory_class, execution_name="PandasOnRay")
 class PandasOnRayFactory(BaseFactory):

modin/core/execution/ray/implementations/pandas_on_ray/io/io.py

@@ -42,12 +42,13 @@
 from modin.experimental.core.io import (
     ExperimentalCSVGlobDispatcher,
     ExperimentalCustomTextDispatcher,
-    ExperimentalPickleDispatcher,
+    ExperimentalGlobDispatcher,
     ExperimentalSQLDispatcher,
 )
 from modin.experimental.core.storage_formats.pandas.parsers import (
     ExperimentalCustomTextParser,
     ExperimentalPandasCSVGlobParser,
+    ExperimentalPandasParquetParser,
     ExperimentalPandasPickleParser,
 )
 
@@ -91,10 +92,20 @@ def __make_write(*classes, build_args=build_args):
     read_csv_glob = __make_read(
         ExperimentalPandasCSVGlobParser, ExperimentalCSVGlobDispatcher
     )
+    read_parquet_glob = __make_read(
+        ExperimentalPandasParquetParser, ExperimentalGlobDispatcher
+    )
+    to_parquet_glob = __make_write(
+        ExperimentalGlobDispatcher,
+        build_args={**build_args, "base_write": RayIO.to_parquet},
+    )
     read_pickle_distributed = __make_read(
-        ExperimentalPandasPickleParser, ExperimentalPickleDispatcher
+        ExperimentalPandasPickleParser, ExperimentalGlobDispatcher
+    )
+    to_pickle_distributed = __make_write(
+        ExperimentalGlobDispatcher,
+        build_args={**build_args, "base_write": RayIO.to_pickle},
     )
-    to_pickle_distributed = __make_write(ExperimentalPickleDispatcher)
     read_custom_text = __make_read(
         ExperimentalCustomTextParser, ExperimentalCustomTextDispatcher
     )

modin/core/execution/unidist/implementations/pandas_on_unidist/io/io.py

@@ -42,12 +42,13 @@
 from modin.experimental.core.io import (
     ExperimentalCSVGlobDispatcher,
     ExperimentalCustomTextDispatcher,
-    ExperimentalPickleDispatcher,
+    ExperimentalGlobDispatcher,
     ExperimentalSQLDispatcher,
 )
 from modin.experimental.core.storage_formats.pandas.parsers import (
     ExperimentalCustomTextParser,
     ExperimentalPandasCSVGlobParser,
+    ExperimentalPandasParquetParser,
     ExperimentalPandasPickleParser,
 )
 
@@ -91,10 +92,20 @@ def __make_write(*classes, build_args=build_args):
     read_csv_glob = __make_read(
         ExperimentalPandasCSVGlobParser, ExperimentalCSVGlobDispatcher
     )
+    read_parquet_glob = __make_read(
+        ExperimentalPandasParquetParser, ExperimentalGlobDispatcher
+    )
+    to_parquet_glob = __make_write(
+        ExperimentalGlobDispatcher,
+        build_args={**build_args, "base_write": UnidistIO.to_parquet},
+    )
     read_pickle_distributed = __make_read(
-        ExperimentalPandasPickleParser, ExperimentalPickleDispatcher
+        ExperimentalPandasPickleParser, ExperimentalGlobDispatcher
+    )
+    to_pickle_distributed = __make_write(
+        ExperimentalGlobDispatcher,
+        build_args={**build_args, "base_write": UnidistIO.to_pickle},
     )
-    to_pickle_distributed = __make_write(ExperimentalPickleDispatcher)
     read_custom_text = __make_read(
         ExperimentalCustomTextParser, ExperimentalCustomTextDispatcher
     )

modin/core/io/io.py

@@ -652,7 +652,7 @@ def to_csv(cls, obj, **kwargs):  # noqa: PR01
     @_inherit_docstrings(
         pandas.DataFrame.to_parquet, apilink="pandas.DataFrame.to_parquet"
     )
-    def to_parquet(cls, obj, **kwargs):  # noqa: PR01
+    def to_parquet(cls, obj, path, **kwargs):  # noqa: PR01
         """
         Write object to the binary parquet format using pandas.
 
@@ -662,4 +662,4 @@ def to_parquet(cls, obj, **kwargs):  # noqa: PR01
         if isinstance(obj, BaseQueryCompiler):
             obj = obj.to_pandas()
 
-        return obj.to_parquet(**kwargs)
+        return obj.to_parquet(path, **kwargs)

modin/experimental/core/io/__init__.py

@@ -13,14 +13,15 @@
 
 """Experimental IO functions implementations."""
 
-from .pickle.pickle_dispatcher import ExperimentalPickleDispatcher
+from .glob.glob_dispatcher import ExperimentalGlobDispatcher
 from .sql.sql_dispatcher import ExperimentalSQLDispatcher
 from .text.csv_glob_dispatcher import ExperimentalCSVGlobDispatcher
 from .text.custom_text_dispatcher import ExperimentalCustomTextDispatcher
 
 __all__ = [
     "ExperimentalCSVGlobDispatcher",
     "ExperimentalSQLDispatcher",
-    "ExperimentalPickleDispatcher",
+    "ExperimentalGlobDispatcher",
+    "ExperimentalGlobDispatcher",
     "ExperimentalCustomTextDispatcher",
 ]

modin/experimental/core/io/pickle/__init__.py → modin/experimental/core/io/glob/__init__.py

@@ -11,4 +11,4 @@
 # ANY KIND, either express or implied. See the License for the specific language
 # governing permissions and limitations under the License.
 
-"""Experimental Pickle format type IO functions implementations."""
+"""Experimental Glob format type IO functions implementations."""

modin/experimental/core/io/pickle/pickle_dispatcher.py → modin/experimental/core/io/glob/glob_dispatcher.py

@@ -11,7 +11,7 @@
 # ANY KIND, either express or implied. See the License for the specific language
 # governing permissions and limitations under the License.
 
-"""Module houses ``ExperimentalPickleDispatcher`` class that is used for reading `.pkl` files."""
+"""Module houses ``ExperimentalGlobDispatcher`` class that is used to read files of different formats in parallel."""
 
 import glob
 import warnings
@@ -24,20 +24,20 @@
 from modin.core.storage_formats.pandas.query_compiler import PandasQueryCompiler
 
 
-class ExperimentalPickleDispatcher(FileDispatcher):
-    """Class handles utils for reading pickle files."""
+class ExperimentalGlobDispatcher(FileDispatcher):
+    """Class implements reading different formats, parallelizing by the number of files."""
 
     @classmethod
-    def _read(cls, filepath_or_buffer, **kwargs):
+    def _read(cls, **kwargs):
         """
         Read data from `filepath_or_buffer` according to `kwargs` parameters.
 
         Parameters
         ----------
         filepath_or_buffer : str, path object or file-like object
-            `filepath_or_buffer` parameter of `read_pickle` function.
+            `filepath_or_buffer` parameter of `read_*` function.
         **kwargs : dict
-            Parameters of `read_pickle` function.
+            Parameters of `read_*` function.
 
         Returns
         -------
@@ -46,10 +46,10 @@ def _read(cls, filepath_or_buffer, **kwargs):
 
         Notes
         -----
-        In experimental mode, we can use `*` in the filename.
-
         The number of partitions is equal to the number of input files.
         """
+        path_key = "filepath_or_buffer" if "filepath_or_buffer" in kwargs else "path"
+        filepath_or_buffer = kwargs.pop(path_key)
         filepath_or_buffer = stringify_path(filepath_or_buffer)
         if not (isinstance(filepath_or_buffer, str) and "*" in filepath_or_buffer):
             return cls.single_worker_read(
@@ -104,37 +104,33 @@ def write(cls, qc, **kwargs):
         - if `*` is in the filename, then it will be replaced by the ascending sequence 0, 1, 2, …
         - if `*` is not in the filename, then the default implementation will be used.
 
-        Example: 4 partitions and input filename="partition*.pkl.gz", then filenames will be:
-        `partition0.pkl.gz`, `partition1.pkl.gz`, `partition2.pkl.gz`, `partition3.pkl.gz`.
-
         Parameters
         ----------
         qc : BaseQueryCompiler
             The query compiler of the Modin dataframe that we want
-            to run ``to_pickle_distributed`` on.
+            to run ``to_<format>_glob`` on.
         **kwargs : dict
-            Parameters for ``pandas.to_pickle(**kwargs)``.
+            Parameters for ``pandas.to_<format>(**kwargs)``.
         """
-        kwargs["filepath_or_buffer"] = stringify_path(kwargs["filepath_or_buffer"])
+        path_key = "filepath_or_buffer" if "filepath_or_buffer" in kwargs else "path"
+        filepath_or_buffer = kwargs.pop(path_key)
+        filepath_or_buffer = stringify_path(filepath_or_buffer)
         if not (
-            isinstance(kwargs["filepath_or_buffer"], str)
-            and "*" in kwargs["filepath_or_buffer"]
+            isinstance(filepath_or_buffer, str) and "*" in filepath_or_buffer
         ) or not isinstance(qc, PandasQueryCompiler):
             warnings.warn("Defaulting to Modin core implementation")
-            cls.base_io.to_pickle(qc, **kwargs)
+            cls.base_write(qc, filepath_or_buffer, **kwargs)
             return
 
+        # Be careful, this is a kind of limitation, but at the time of the first implementation,
+        # getting a name in this way is quite convenient.
+        # We can use this attribute because the names of the BaseIO's methods match pandas API.
+        write_func_name = cls.base_write.__name__
+
         def func(df, **kw):  # pragma: no cover
             idx = str(kw["partition_idx"])
-            # dask doesn't make a copy of kwargs on serialization;
-            # so take a copy ourselves, otherwise the error is:
-            #  kwargs["path"] = kwargs.pop("filepath_or_buffer").replace("*", idx)
-            #  KeyError: 'filepath_or_buffer'
-            dask_kwargs = dict(kwargs)
-            dask_kwargs["path"] = dask_kwargs.pop("filepath_or_buffer").replace(
-                "*", idx
-            )
-            df.to_pickle(**dask_kwargs)
+            path = filepath_or_buffer.replace("*", idx)
+            getattr(df, write_func_name)(path, **kwargs)
             return pandas.DataFrame()
 
         result = qc._modin_frame.apply_full_axis(

modin/experimental/core/storage_formats/pandas/parsers.py

@@ -114,6 +114,24 @@ def parse(fname, **kwargs):
         return _split_result_for_readers(1, num_splits, df) + [length, width]
 
 
+@doc(_doc_pandas_parser_class, data_type="parquet files")
+class ExperimentalPandasParquetParser(PandasParser):
+    @staticmethod
+    @doc(_doc_parse_func, parameters=_doc_parse_parameters_common)
+    def parse(fname, **kwargs):
+        warnings.filterwarnings("ignore")
+        num_splits = 1
+        single_worker_read = kwargs.pop("single_worker_read", None)
+        df = pandas.read_parquet(fname, **kwargs)
+        if single_worker_read:
+            return df
+
+        length = len(df)
+        width = len(df.columns)
+
+        return _split_result_for_readers(1, num_splits, df) + [length, width]
+
+
 @doc(_doc_pandas_parser_class, data_type="custom text")
 class ExperimentalCustomTextParser(PandasParser):
     @staticmethod

modin/experimental/pandas/__init__.py

@@ -40,6 +40,7 @@
 from .io import (  # noqa F401
     read_csv_glob,
     read_custom_text,
+    read_parquet_glob,
     read_pickle_distributed,
     read_sql,
     to_pickle_distributed,