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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Work logged] (HIVE-25370) Improve SharedWorkOptimizer performance
Date Wed, 28 Jul 2021 08:01:00 GMT


ASF GitHub Bot logged work on HIVE-25370:

                Author: ASF GitHub Bot
            Created on: 28/Jul/21 08:00
            Start Date: 28/Jul/21 08:00
    Worklog Time Spent: 10m 
      Work Description: kgyrtkirk commented on pull request #2536:

   `df3fc9b` had a clean testrun;
   the diff agains `df3fc9b` is only a [message change](
- which is clearly unrelated; will launch a flaky check.

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Issue Time Tracking

    Worklog Id:     (was: 628914)
    Time Spent: 0.5h  (was: 20m)

> Improve SharedWorkOptimizer performance
> ---------------------------------------
>                 Key: HIVE-25370
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
> for queries which are unioning ~800 constant rows the SWO is doing around n*n/2 operations
trying to find 2 TS-es which could be merged
> {code}
> select constants
> ...
> select constants
> {code}

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