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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Work logged] (HIVE-21857) Sort conditions in a filter predicate to accelerate query processing
Date Wed, 12 Jun 2019 23:28:00 GMT


ASF GitHub Bot logged work on HIVE-21857:

                Author: ASF GitHub Bot
            Created on: 12/Jun/19 23:27
            Start Date: 12/Jun/19 23:27
    Worklog Time Spent: 10m 
      Work Description: jcamachor commented on pull request #671: HIVE-21857
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Issue Time Tracking

            Worklog Id:     (was: 259168)
            Time Spent: 10m
    Remaining Estimate: 0h

> Sort conditions in a filter predicate to accelerate query processing
> --------------------------------------------------------------------
>                 Key: HIVE-21857
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-21857.01.patch, HIVE-21857.02.patch, HIVE-21857.03.patch
>          Time Spent: 10m
>  Remaining Estimate: 0h
> Following approach similar to .
> To reorder predicates in AND conditions, we could rank each of elements in the clauses
in increasing order based on following formula:
> {code}
> rank = (selectivity - 1) / cost per tuple
> {code}
> Similarly, for OR conditions:
> {code}
> rank = (-selectivity) / cost per tuple
> {code}
> Selectivity can be computed with FilterSelectivityEstimator. For cost per tuple, we will
need to come up with some heuristic based on how expensive is the evaluation of the functions
contained in that predicate. Custom UDFs could be annotated.

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