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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4053) Reduce metadata cache file size
Date Sat, 14 Nov 2015 01:03:10 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15005001#comment-15005001
] 

ASF GitHub Bot commented on DRILL-4053:
---------------------------------------

Github user StevenMPhillips commented on the pull request:

    https://github.com/apache/drill/pull/254#issuecomment-156602190
  
    Why do you need to know the version before reading the file?


> Reduce metadata cache file size
> -------------------------------
>
>                 Key: DRILL-4053
>                 URL: https://issues.apache.org/jira/browse/DRILL-4053
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Metadata
>    Affects Versions: 1.3.0
>            Reporter: Parth Chandra
>            Assignee: Parth Chandra
>             Fix For: 1.4.0
>
>
> The parquet metadata cache file has fair amount of redundant metadata that causes the
size of the cache file to bloat. Two things that we can reduce are :
> 1) Schema is repeated for every row group. We can keep a merged schema (similar to what
was discussed for insert into functionality) 2) The max and min value in the stats are used
for partition pruning when the values are the same. We can keep the maxValue only and that
too only if it is the same as the minValue.



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