[jira] [Created] (ARROW-16616) [Python] Allow lazy evaluation of filters in Dataset and add Datset.filter method

["Alessandro Molina (Jira)" <ji...@apache.org>]

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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