[jira] [Work logged] (HIVE-23006) Basic compiler support for Probe MapJoin

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-23006?focusedWorklogId=421434&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-421434 ]

ASF GitHub Bot logged work on HIVE-23006:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 13/Apr/20 17:01
            Start Date: 13/Apr/20 17:01
    Worklog Time Spent: 10m 
      Work Description: asfgit commented on pull request #952: HIVE-23006 ProbeDecode compiler support
URL: https://github.com/apache/hive/pull/952
 
 
   
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 421434)
    Time Spent: 3h 10m  (was: 3h)

> Basic compiler support for Probe MapJoin
> ----------------------------------------
>
>                 Key: HIVE-23006
>                 URL: https://issues.apache.org/jira/browse/HIVE-23006
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Panagiotis Garefalakis
>            Assignee: Panagiotis Garefalakis
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-23006.01.patch, HIVE-23006.02.patch, HIVE-23006.03.patch, HIVE-23006.04.patch, HIVE-23006.05.patch, HIVE-23006.06.patch, HIVE-23006.07.patch, HIVE-23006.08.patch
>
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>
> The decision of pushing down information to the Record reader (potentially reducing decoding time by row-level filtering) should be done at query compilation time.
> This patch adds an extra optimisation step with the goal of finding Table Scan operators that could reduce the number of rows decoded at runtime using extra available information.
> It currently looks for all the available MapJoin operators that could use the smaller HashTable on the probing side (where TS is) to filter-out rows that would never match. 
> To do so the HashTable information is pushed down to the TS properties and then propagated as part of MapWork.
> If the a single TS is used by multiple operators (shared-word), this rule can not be applied.
> This rule can be extended to support static filter expressions like:
> _select * from sales where sold_state = 'PR';_
> This optimisation manly targets the Tez execution engine running on Llap.



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