[jira] [Created] (SPARK-25379) Improve ColumnPruning performance

["Marco Gaido (JIRA)" <ji...@apache.org>]

Marco Gaido created SPARK-25379:
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             Summary: Improve ColumnPruning performance
                 Key: SPARK-25379
                 URL: https://issues.apache.org/jira/browse/SPARK-25379
             Project: Spark
          Issue Type: Sub-task
          Components: Optimizer, SQL
    Affects Versions: 2.4.0
            Reporter: Marco Gaido


The {{--}} operation on {{AttributeSet}} is quite expensive, especially where many columns are involved. {{ColumnPruning}} heavily relies on that operator and this affects its running time. There are 2 optimization which are possible:

 - Improve {{--}} performance;
 - Replace {{--}} with {{subsetOf}} when possible.

Moreover, when building {{AttributeSet}}s we often do unneeded operations. This also impacts other rules less significantly.

I'll provide more details about the performance improvement achievable in the PR.



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