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From jianqiao <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #155: Add min/max statistics and the exactn...
Date Sat, 17 Dec 2016 01:16:16 GMT
GitHub user jianqiao opened a pull request:

    https://github.com/apache/incubator-quickstep/pull/155

    Add min/max statistics and the exactness flag into CatalogRelationStatistic

    This PR collects the min/max statistics for each column of a table with the `\analyze`
command. It also adds an `is_exact_` flag into `CatalogRelationStatistic` to indicate whether
the statistics are up-to-date. Each table's `is_exact_` flag will be set to `true` with the
`\analyze` command on that table, and will be set to `false` with the  _insert/delete/copy_
operations on that table.
    
    This PR is a preparation for implementing some fast-path operators (e.g. exact filters
and vector-based aggregation) that significantly improve Quickstep's performance on some of
the SSB/TPC-H queries.
    
    
    
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/apache/incubator-quickstep min-max-stats

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-quickstep/pull/155.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #155
    
----
commit a87c1b24b5cbe35ef5b97340b2c727dd8c8d1e30
Author: Jianqiao Zhu <jianqiao@cs.wisc.edu>
Date:   2016-10-27T19:16:32Z

    Add min/max statistics and the exactness flag into CatalogRelationStatistics.

----


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