Add more tests for read_parquet(engine='pyarrow')#2822
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| pandas_metadata = json.loads(schema.metadata[b'pandas'].decode('utf8')) | ||
| index_col = pandas_metadata.get('index_columns', None) | ||
| else: | ||
| index_col = index |
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Can any of this metadata wrangling be pushed down into pyarrow?
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The retrieval of the index column should be definitely pushed down to pyarrow. Currently there is no such functionality on the ParquetDataset. I can add that for future releases. This PR mainly covers the parts where we can satisfy the tests without developing new features in pyarrow.
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From my perspective this looks good. I suspect that @martindurant would have a more discerning eye here. |
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Not much to say, looks fair enough. |
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@martindurant No, I have not seen any multi-column index tests yet in the Parquet engine tests. We should have a look at them in a follow-up PR. |
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I plan to merge this tomorrow if there are no further comments. |
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Merged. Thanks @xhochy ! |
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I'm not happy with the lines added to
_read_arrow_parquet_piece. We may need to add tests forMultiIndexin the future to ensure that they also work.flake8 daskdocs/source/changelog.rstfor all changesand one of the
docs/source/*-api.rstfiles for new APIcc @wesm @fjetter