Alessandro Molina created ARROW-16616:
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Summary: [Python] Allow lazy evaluation of filters in Dataset and
add Datset.filter method
Key: ARROW-16616
URL: https://issues.apache.org/jira/browse/ARROW-16616
Project: Apache Arrow
Issue Type: Sub-task
Components: Python
Reporter: Alessandro Molina
Fix For: 9.0.0
To keep the {{Dataset}} api compatible with the {{Table}} one in terms of
analytics capabilities, we should add a {{Dataset.filter}} method. The initial
POC was based on {{_table_filter}} but that required materialising all the
{{Dataset}} content after filtering as it returned an {{{}InMemoryDataset{}}}.
Given that {{Scanner}} can filter a dataset without actually materialising the
data until a final step happens, it would be good to have {{Dataset.filter}}
return some form of lazy dataset when the filter is only stored aside and the
Scanner is created when data is actually retrieved.
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