hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jesus Camacho Rodriguez (JIRA)" <>
Subject [jira] [Updated] (HIVE-13069) Enable cartesian product merging
Date Wed, 02 Mar 2016 17:06:18 GMT


Jesus Camacho Rodriguez updated HIVE-13069:
       Resolution: Fixed
    Fix Version/s: 2.1.0
           Status: Resolved  (was: Patch Available)

Regenerated q files and pushed to master. Thanks for the review [~ashutoshc]!

> Enable cartesian product merging
> --------------------------------
>                 Key: HIVE-13069
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Parser
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>             Fix For: 2.1.0
>         Attachments: HIVE-13069.01.patch, HIVE-13069.01.patch, HIVE-13069.patch
> Currently we can merge 2-way joins into n-way joins when the joins are executed over
the same column.
> In turn, CBO might produce plans containing cartesian products if the join columns are
constant values; after HIVE-12543 went in, this is rather common, as those constant columns
are correctly pruned. However, currently we do not merge a cartesian product with two inputs
into a cartesian product with multiple inputs, which could result in performance loss.

This message was sent by Atlassian JIRA

View raw message