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https://issues.apache.org/jira/browse/DRILL-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128751#comment-15128751
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ASF GitHub Bot commented on DRILL-4287:
---------------------------------------

Github user jinfengni commented on the pull request:

    https://github.com/apache/drill/pull/345#issuecomment-178746517
  
    Overall, looks good to me. 
    
    +1



> Do lazy reading of parquet metadata cache file
> ----------------------------------------------
>
>                 Key: DRILL-4287
>                 URL: https://issues.apache.org/jira/browse/DRILL-4287
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.4.0
>            Reporter: Aman Sinha
>            Assignee: Jinfeng Ni
>
> Currently, the parquet metadata cache file is read eagerly during creation of 
> the DrillTable (as part of ParquetFormatMatcher.isReadable()).  This is not 
> desirable from performance standpoint since there are scenarios where we want 
> to do some up-front optimizations - e.g. directory-based partition pruning 
> (see DRILL-2517) or potential limit 0 optimization etc. - and in such 
> situations it is better to do lazy reading of the metadata cache file.   
> This is a placeholder to perform such delayed reading since it is needed for 
> the aforementioned optimizations.  



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