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
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commit a87c1b24b5cbe35ef5b97340b2c727dd8c8d1e30
Author: Jianqiao Zhu <jianq...@cs.wisc.edu>
Date: 2016-10-27T19:16:32Z
Add min/max statistics and the exactness flag into
CatalogRelationStatistics.
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