FEAT-#7331: Initial Polars API (#7332)

* FEAT-#7331: Initial Polars API

This commit adds a polars namespace to Modin, and the DataFrame and
Series objects and their respective APIs. This doesn't include error
handling and is still missing several polars features:

* LazyFrame
* Expressions
* String, Temporal, Struct, and other Series accessors
* Several parameters
* Operators that we don't have query compiler methods for
   * e.g. sin, cos, tan, etc.

Those will be handled in a future PR.

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Lint

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* flake8

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* isort

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* headers

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* forgot one

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Add test

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* header

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* isort

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Add to CI

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* fix name

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Update modin/polars/base.py

Co-authored-by: Mahesh Vashishtha <mahesh.vashishtha@snowflake.com>

* address comments

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* polars 1

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Update for polars 1.x and fix some hacks

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Remove hax

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Black

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Address comments

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Lint

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

* Address comment

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>

---------

Signed-off-by: Devin Petersohn <devin.petersohn@snowflake.com>
Co-authored-by: Devin Petersohn <devin.petersohn@snowflake.com>
Co-authored-by: Mahesh Vashishtha <mahesh.vashishtha@snowflake.com>

.github/workflows/ci.yml

@@ -462,6 +462,7 @@ jobs:
         if: matrix.engine == 'python' || matrix.test_task == 'group_4'
       - run: python -m pytest modin/tests/interchange/dataframe_protocol/pandas/test_protocol.py
         if: matrix.engine == 'python' || matrix.test_task == 'group_4'
+      - run: python -m pytest modin/tests/polars/test_dataframe.py
       - run: |
           python -m pip install lazy_import
           python -m pytest modin/tests/pandas/integrations/

environment-dev.yml

@@ -70,3 +70,4 @@ dependencies:
       - git+https://github.com/modin-project/modin-spreadsheet.git@49ffd89f683f54c311867d602c55443fb11bf2a5
       # The `numpydoc` version should match the version installed in the `lint-pydocstyle` job of the CI.
       - numpydoc==1.6.0
+      - polars

modin/polars/__init__.py

@@ -0,0 +1,17 @@
+# 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.
+
+from modin.polars.dataframe import DataFrame
+from modin.polars.series import Series
+
+__all__ = ["DataFrame", "Series"]