simicd commented on code in PR #236: URL: https://github.com/apache/arrow-datafusion-python/pull/236#discussion_r1117943147
########## examples/export.py: ########## @@ -0,0 +1,60 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF 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. + +import datafusion +from datafusion import col +import pyarrow +import polars as pl + + +# create a context +ctx = datafusion.SessionContext() + +# create a RecordBatch and a new datafusion DataFrame from it +batch = pyarrow.RecordBatch.from_arrays( + [pyarrow.array([1, 2, 3]), pyarrow.array([4, 5, 6])], + names=["a", "b"], +) +df = ctx.create_dataframe([[batch]]) +# Dataframe: +# +---+---+ +# | a | b | +# +---+---+ +# | 1 | 4 | +# | 2 | 5 | +# | 3 | 6 | +# +---+---+ + +# export to pandas dataframe +pandas_df = df.to_pandas() +assert pandas_df.shape == (3, 2) + +# export to PyArrow table +arrow_table = df.to_arrow_table() +assert arrow_table.shape == (3, 2) + +# export to Polars dataframe +polars_df = pl.DataFrame(df.to_arrow_table()) +assert polars_df.shape == (3, 2) Review Comment: Thanks for the feedback - added `to_polars()` method & unit tests for it -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
