REFACTOR-#6012: move experimental dispatchers under modin/experimental/... folder

docs/development/architecture.rst

@@ -232,6 +232,10 @@ documentation page on :doc:`contributing </development/contributing>`.
     - Uses the Unidist_ execution framework.
     - The storage format is `pandas` and the in-memory partition type is a pandas DataFrame.
     - For more information on the execution path, see the :doc:`experimental pandas on Unidist </flow/modin/experimental/core/execution/unidist/implementations/pandas_on_unidist/index>` page.
+- pandas on Dask (experimental)
+    - Uses the Dask_ execution framework.
+    - The storage format is `pandas` and the in-memory partition type is a pandas DataFrame.
+    - For more information on the execution path, see the :doc:`experimental pandas on Dask </flow/modin/experimental/core/execution/dask/implementations/pandas_on_dask/index>` page.
 - :doc:`HDK on Native </development/using_hdk>` (experimental)
     - Uses HDK as an engine.
     - The storage format is `hdk` and the in-memory partition type is a pyarrow Table. When defaulting to pandas, the pandas DataFrame is used.
@@ -344,12 +348,16 @@ details. The documentation covers most modules, with more docs being added every
    │   │   │   │   │   └───implementations
    │   │   │   │   │       ├─── :doc:`pandas_on_ray </flow/modin/experimental/core/execution/ray/implementations/pandas_on_ray/index>`
    │   │   │   │   │       └─── :doc:`pyarrow_on_ray </flow/modin/experimental/core/execution/ray/implementations/pyarrow_on_ray>`
-   │   │   │   │   └───unidist
-   │   │   │   │       └───implementations
-   │   │   │   │           └─── :doc:`pandas_on_unidist </flow/modin/experimental/core/execution/unidist/implementations/pandas_on_unidist/index>`
-   │   │   │   └─── :doc:`storage_formats </flow/modin/experimental/core/storage_formats/index>`
-   |   │   │       ├─── :doc:`hdk </flow/modin/experimental/core/storage_formats/hdk/index>`
-   │   │   │       └─── :doc:`pyarrow </flow/modin/experimental/core/storage_formats/pyarrow/index>`
+   │   │   │   │   ├───unidist
+   │   │   │   │   |   └───implementations
+   │   │   │   │   |       └─── :doc:`pandas_on_unidist </flow/modin/experimental/core/execution/unidist/implementations/pandas_on_unidist/index>`
+   |   │   |   |   └───dask
+   |   |   |   |       └───implementations
+   │   │   │   │           └─── :doc:`pandas_on_dask </flow/modin/experimental/core/execution/dask/implementations/pandas_on_dask/index>`
+   │   │   │   ├─── :doc:`storage_formats </flow/modin/experimental/core/storage_formats/index>`
+   |   │   │   |   ├─── :doc:`hdk </flow/modin/experimental/core/storage_formats/hdk/index>`
+   │   │   │   |   └─── :doc:`pyarrow </flow/modin/experimental/core/storage_formats/pyarrow/index>`
+   |   |   |   └─── :doc:`io </flow/modin/experimental/core/io/index>`
    │   │   ├─── :doc:`pandas </flow/modin/experimental/pandas>`
    │   │   ├─── :doc:`sklearn </flow/modin/experimental/sklearn>`
    │   │   ├───spreadsheet
@@ -368,6 +376,7 @@ details. The documentation covers most modules, with more docs being added every
 .. _Ray: https://github.com/ray-project/ray
 .. _Unidist: https://github.com/modin-project/unidist
 .. _code: https://github.com/modin-project/modin/blob/master/modin/core/dataframe
+.. _Dask: https://github.com/dask/dask
 .. _Dask Futures: https://docs.dask.org/en/latest/futures.html
 .. _issue: https://github.com/modin-project/modin/issues
 .. _Discourse: https://discuss.modin.org

docs/flow/modin/core/io/index.rst

@@ -59,8 +59,7 @@ classes for reading files of different formats.
     ``_read_rows`` function for moving file offset at the specified amount of rows
     and many other functions.
 
-  * format/feature specific dispatchers: ``csv_dispatcher.py``, ``csv_glob_dispatcher.py``
-    (reading multiple files simultaneously, experimental feature), ``excel_dispatcher.py``,
+  * format/feature specific dispatchers: ``csv_dispatcher.py``, ``excel_dispatcher.py``,
     ``fwf_dispatcher.py`` and ``json_dispatcher.py``.
 
 * column_stores - directory for storing all columnar store file format dispatcher classes

docs/flow/modin/experimental/core/execution/dask/implementations/pandas_on_dask/index.rst

@@ -0,0 +1,25 @@
+:orphan:
+
+ExperimentalPandasOnDask Execution
+==================================
+
+`ExperimentalPandasOnDask` execution keeps the underlying mechanisms of :doc:`PandasOnDask </flow/modin/core/execution/dask/implementations/pandas_on_dask/index>`
+execution architecturally unchanged and adds experimental features of ``Data Transformation``, ``Data Ingress`` and ``Data Egress`` (e.g. :py:func:`~modin.experimental.pandas.read_pickle_distributed`).
+
+PandasOnDask and ExperimentalPandasOnDask differences
+-----------------------------------------------------
+
+- another Factory ``PandasOnDaskFactory`` -> ``ExperimentalPandasOnDaskFactory``
+- another IO class ``PandasOnDaskIO`` -> ``ExperimentalPandasOnDaskIO``
+
+ExperimentalPandasOnDaskIO classes and modules
+----------------------------------------------
+
+- :py:class:`~modin.experimental.core.execution.dask.implementations.pandas_on_dask.io.io.ExperimentalPandasOnDaskIO`
+- :py:class:`~modin.core.execution.dispatching.factories.factories.ExperimentalPandasOnDaskFactory`
+- :py:class:`~modin.experimental.core.io.text.csv_glob_dispatcher.ExperimentalCSVGlobDispatcher`
+- :py:class:`~modin.experimental.core.io.sql.sql_dispatcher.ExperimentalSQLDispatcher`
+- :py:class:`~modin.experimental.core.io.pickle.pickle_dispatcher.ExperimentalPickleDispatcher`
+- :py:class:`~modin.experimental.core.io.text.custom_text_dispatcher.ExperimentalCustomTextDispatcher`
+- :py:class:`~modin.core.storage_formats.pandas.parsers.PandasCSVGlobParser`
+- :doc:`ExperimentalPandasOnDask IO module </flow/modin/experimental/core/execution/dask/implementations/pandas_on_dask/io/index>`

docs/flow/modin/experimental/core/execution/dask/implementations/pandas_on_dask/io/index.rst

@@ -0,0 +1,38 @@
+:orphan:
+
+IO module Description For ExperimentalPandasOnDask Execution
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+High-Level Module Overview
+''''''''''''''''''''''''''
+
+This module houses experimental functionality with pandas storage format and Dask
+engine. This functionality is concentrated in the :py:class:`~modin.experimental.core.execution.dask.implementations.pandas_on_dask.io.io.ExperimentalPandasOnDaskIO`
+class, that contains methods, which extend typical pandas API to give user
+more flexibility with IO operations.
+
+Usage Guide
+'''''''''''
+
+In order to use the experimental features, just modify standard Modin import
+statement as follows:
+
+.. code-block:: python
+
+  # import modin.pandas as pd
+  import modin.experimental.pandas as pd
+
+Submodules Description
+''''''''''''''''''''''
+
+The ``modin.experimental.core.execution.dask.implementations.pandas_on_dask`` module primarily houses utils and 
+functions for the experimental IO class:
+
+* ``io.py`` - submodule containing IO class and parse functions, which are responsible
+  for data processing on the workers.
+
+Public API
+''''''''''
+
+.. autoclass:: modin.experimental.core.execution.dask.implementations.pandas_on_dask.io.io.ExperimentalPandasOnDaskIO
+  :members:

docs/flow/modin/experimental/core/execution/ray/implementations/pandas_on_ray/index.rst

@@ -17,6 +17,9 @@ ExperimentalPandasOnRayIO classes and modules
 
 - :py:class:`~modin.experimental.core.execution.ray.implementations.pandas_on_ray.io.io.ExperimentalPandasOnRayIO`
 - :py:class:`~modin.core.execution.dispatching.factories.factories.ExperimentalPandasOnRayFactory`
-- :py:class:`~modin.core.io.text.csv_glob_dispatcher.CSVGlobDispatcher`
+- :py:class:`~modin.experimental.core.io.text.csv_glob_dispatcher.ExperimentalCSVGlobDispatcher`
+- :py:class:`~modin.experimental.core.io.sql.sql_dispatcher.ExperimentalSQLDispatcher`
+- :py:class:`~modin.experimental.core.io.pickle.pickle_dispatcher.ExperimentalPickleDispatcher`
+- :py:class:`~modin.experimental.core.io.text.custom_text_dispatcher.ExperimentalCustomTextDispatcher`
 - :py:class:`~modin.core.storage_formats.pandas.parsers.PandasCSVGlobParser`
 - :doc:`ExperimentalPandasOnRay IO module </flow/modin/experimental/core/execution/ray/implementations/pandas_on_ray/io/index>`

docs/flow/modin/experimental/core/execution/ray/implementations/pandas_on_ray/io/index.rst

@@ -1,7 +1,7 @@
 :orphan:
 
-IO module Description For Pandas-on-Ray Execution
-"""""""""""""""""""""""""""""""""""""""""""""""""
+IO module Description For ExperimentalPandasOnRay Execution
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 
 High-Level Module Overview
 ''''''''''''''''''''''''''
@@ -31,8 +31,6 @@ functions for the experimental IO class:
 * ``io.py`` - submodule containing IO class and parse functions, which are responsible
   for data processing on the workers.
 
-* ``sql.py`` - submodule with util functions for experimental ``read_sql`` function.
-
 Public API
 ''''''''''
 

docs/flow/modin/experimental/core/execution/unidist/implementations/pandas_on_unidist/index.rst

@@ -17,6 +17,9 @@ ExperimentalPandasOnUnidistIO classes and modules
 
 - :py:class:`~modin.experimental.core.execution.unidist.implementations.pandas_on_unidist.io.io.ExperimentalPandasOnUnidistIO`
 - :py:class:`~modin.core.execution.dispatching.factories.factories.ExperimentalPandasOnUnidistFactory`
-- :py:class:`~modin.core.io.text.csv_glob_dispatcher.CSVGlobDispatcher`
+- :py:class:`~modin.experimental.core.io.text.csv_glob_dispatcher.ExperimentalCSVGlobDispatcher`
+- :py:class:`~modin.experimental.core.io.sql.sql_dispatcher.ExperimentalSQLDispatcher`
+- :py:class:`~modin.experimental.core.io.pickle.pickle_dispatcher.ExperimentalPickleDispatcher`
+- :py:class:`~modin.experimental.core.io.text.custom_text_dispatcher.ExperimentalCustomTextDispatcher`
 - :py:class:`~modin.core.storage_formats.pandas.parsers.PandasCSVGlobParser`
 - :doc:`ExperimentalPandasOnUnidist IO module </flow/modin/experimental/core/execution/unidist/implementations/pandas_on_unidist/io/index>`

docs/flow/modin/experimental/core/execution/unidist/implementations/pandas_on_unidist/io/index.rst

@@ -1,7 +1,7 @@
 :orphan:
 
-IO module Description For Pandas-on-Unidist Execution
-"""""""""""""""""""""""""""""""""""""""""""""""""""""
+IO module Description For ExperimentalPandasOnUnidist Execution
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 
 High-Level Module Overview
 ''''''''''''''''''''''''''
@@ -31,8 +31,6 @@ functions for the experimental IO class:
 * ``io.py`` - submodule containing IO class and parse functions, which are responsible
   for data processing on the workers.
 
-* ``sql.py`` - submodule with util functions for experimental ``read_sql`` function.
-
 Public API
 ''''''''''
 

docs/flow/modin/experimental/core/io/index.rst

@@ -0,0 +1,29 @@
+:orphan:
+
+Experimental IO Module Description
+""""""""""""""""""""""""""""""""""
+
+The module is used mostly for storing experimental utils and
+dispatcher classes for reading/writing files of different formats.
+
+Submodules Description
+''''''''''''''''''''''
+
+* text - directory for storing all text file format dispatcher classes
+
+  * format/feature specific dispatchers: ``csv_glob_dispatcher.py``,
+    ``custom_text_dispatcher.py``.
+
+* sql - directory for storing SQL dispatcher class
+
+  * format/feature specific dispatchers: ``sql_dispatcher.py``
+
+* pickle - directory for storing Pickle dispatcher class
+
+  * format/feature specific dispatchers: ``pickle_dispatcher.py``
+
+Public API
+''''''''''
+
+.. automodule:: modin.experimental.core.io
+    :members:

modin/core/io/__init__.py

@@ -15,12 +15,8 @@
 
 from .io import BaseIO
 from .text.csv_dispatcher import CSVDispatcher
-from .text.csv_glob_dispatcher import CSVGlobDispatcher
 from .text.fwf_dispatcher import FWFDispatcher
 from .text.json_dispatcher import JSONDispatcher
-from .text.custom_text_dispatcher import (
-    ExperimentalCustomTextDispatcher,
-)
 from .text.excel_dispatcher import ExcelDispatcher
 from .file_dispatcher import FileDispatcher
 from .text.text_file_dispatcher import TextFileDispatcher
@@ -32,7 +28,6 @@
 __all__ = [
     "BaseIO",
     "CSVDispatcher",
-    "CSVGlobDispatcher",
     "FWFDispatcher",
     "JSONDispatcher",
     "FileDispatcher",
@@ -42,5 +37,4 @@
     "FeatherDispatcher",
     "SQLDispatcher",
     "ExcelDispatcher",
-    "ExperimentalCustomTextDispatcher",
 ]

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

@@ -25,13 +25,11 @@
 )
 from modin.core.storage_formats.pandas.query_compiler import PandasQueryCompiler
 from modin.core.execution.dask.implementations.pandas_on_dask.io import PandasOnDaskIO
-from modin.core.io import (
-    CSVGlobDispatcher,
-    ExperimentalCustomTextDispatcher,
-)
 from modin.experimental.core.io import (
+    ExperimentalCSVGlobDispatcher,
     ExperimentalSQLDispatcher,
     ExperimentalPickleDispatcher,
+    ExperimentalCustomTextDispatcher,
 )
 
 from modin.core.execution.dask.implementations.pandas_on_dask.dataframe import (
@@ -66,7 +64,7 @@ def __make_write(*classes, build_args=build_args):
         # used to reduce code duplication
         return type("", (DaskWrapper, *classes), build_args).write
 
-    read_csv_glob = __make_read(PandasCSVGlobParser, CSVGlobDispatcher)
+    read_csv_glob = __make_read(PandasCSVGlobParser, ExperimentalCSVGlobDispatcher)
     read_pickle_distributed = __make_read(
         ExperimentalPandasPickleParser, ExperimentalPickleDispatcher
     )

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

@@ -25,13 +25,11 @@
 )
 from modin.core.storage_formats.pandas.query_compiler import PandasQueryCompiler
 from modin.core.execution.ray.implementations.pandas_on_ray.io import PandasOnRayIO
-from modin.core.io import (
-    CSVGlobDispatcher,
-    ExperimentalCustomTextDispatcher,
-)
 from modin.experimental.core.io import (
+    ExperimentalCSVGlobDispatcher,
     ExperimentalSQLDispatcher,
     ExperimentalPickleDispatcher,
+    ExperimentalCustomTextDispatcher,
 )
 from modin.core.execution.ray.implementations.pandas_on_ray.dataframe import (
     PandasOnRayDataframe,
@@ -65,7 +63,7 @@ def __make_write(*classes, build_args=build_args):
         # used to reduce code duplication
         return type("", (RayWrapper, *classes), build_args).write
 
-    read_csv_glob = __make_read(PandasCSVGlobParser, CSVGlobDispatcher)
+    read_csv_glob = __make_read(PandasCSVGlobParser, ExperimentalCSVGlobDispatcher)
     read_pickle_distributed = __make_read(
         ExperimentalPandasPickleParser, ExperimentalPickleDispatcher
     )

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

@@ -27,13 +27,11 @@
 from modin.core.execution.unidist.implementations.pandas_on_unidist.io import (
     PandasOnUnidistIO,
 )
-from modin.core.io import (
-    CSVGlobDispatcher,
-    ExperimentalCustomTextDispatcher,
-)
 from modin.experimental.core.io import (
+    ExperimentalCSVGlobDispatcher,
     ExperimentalSQLDispatcher,
     ExperimentalPickleDispatcher,
+    ExperimentalCustomTextDispatcher,
 )
 from modin.core.execution.unidist.implementations.pandas_on_unidist.dataframe import (
     PandasOnUnidistDataframe,
@@ -67,7 +65,7 @@ def __make_write(*classes, build_args=build_args):
         # used to reduce code duplication
         return type("", (UnidistWrapper, *classes), build_args).write
 
-    read_csv_glob = __make_read(PandasCSVGlobParser, CSVGlobDispatcher)
+    read_csv_glob = __make_read(PandasCSVGlobParser, ExperimentalCSVGlobDispatcher)
     read_pickle_distributed = __make_read(
         ExperimentalPandasPickleParser, ExperimentalPickleDispatcher
     )

modin/experimental/core/io/__init__.py

@@ -13,10 +13,14 @@
 
 """Experimental IO functions implementations."""
 
+from .text.csv_glob_dispatcher import ExperimentalCSVGlobDispatcher
 from .sql.sql_dispatcher import ExperimentalSQLDispatcher
 from .pickle.pickle_dispatcher import ExperimentalPickleDispatcher
+from .text.custom_text_dispatcher import ExperimentalCustomTextDispatcher
 
 __all__ = [
+    "ExperimentalCSVGlobDispatcher",
     "ExperimentalSQLDispatcher",
     "ExperimentalPickleDispatcher",
+    "ExperimentalCustomTextDispatcher",
 ]

modin/experimental/core/io/text/__init__.py

@@ -0,0 +1,14 @@
+# Licensed to Modin Development Team under one or more contributor license agreements.
+# See the NOTICE file distributed with this work for additional information regarding
+# copyright ownership.  The Modin Development Team licenses this file to you under the
+# Apache License, Version 2.0 (the "License"); you may not use this file except in
+# compliance with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under
+# the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific language
+# governing permissions and limitations under the License.
+
+"""Experimental text format type IO functions implementations."""

modin/core/io/text/csv_glob_dispatcher.py → modin/experimental/core/io/text/csv_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 `CSVGlobDispatcher` class, that is used for reading multiple `.csv` files simultaneously."""
+"""Module houses `ExperimentalCSVGlobDispatcher` class, that is used for reading multiple `.csv` files simultaneously."""
 
 from contextlib import ExitStack
 import csv
@@ -30,7 +30,7 @@
 from modin.core.io.text.csv_dispatcher import CSVDispatcher
 
 
-class CSVGlobDispatcher(CSVDispatcher):
+class ExperimentalCSVGlobDispatcher(CSVDispatcher):
     """Class contains utils for reading multiple `.csv` files simultaneously."""
 
     @classmethod