[jira] [Closed] (DRILL-4287) Do lazy reading of parquet metadata cache file

["Dechang Gu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dechang Gu closed DRILL-4287.
-----------------------------

Verified, looks good.

> 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: Aman Sinha
>             Fix For: 1.6.0
>
>
> 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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