[jira] [Work logged] (HIVE-26524) Use Calcite to remove sections of a query plan known never produces rows

[ASF GitHub Bot (Jira)]

     [ 
https://issues.apache.org/jira/browse/HIVE-26524?focusedWorklogId=814413&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-814413
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ASF GitHub Bot logged work on HIVE-26524:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 06/Oct/22 15:28
            Start Date: 06/Oct/22 15:28
    Worklog Time Spent: 10m 
      Work Description: sonarcloud[bot] commented on PR #3588:
URL: https://github.com/apache/hive/pull/3588#issuecomment-1270269524

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 814413)
    Time Spent: 6h 40m  (was: 6.5h)

> Use Calcite to remove sections of a query plan known never produces rows
> ------------------------------------------------------------------------
>
>                 Key: HIVE-26524
>                 URL: https://issues.apache.org/jira/browse/HIVE-26524
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Krisztian Kasa
>            Assignee: Krisztian Kasa
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 6h 40m
>  Remaining Estimate: 0h
>
> Calcite has a set of rules to remove sections of a query plan known never 
> produces any rows. In some cases the whole plan can be removed. Such plans 
> are represented with a single {{Values}} operators with no tuples. ex.:
> {code:java}
> select y + 1 from (select a1 y, b1 z from t1 where b1 > 10) q WHERE 1=0
> {code}
> {code:java}
> HiveValues(tuples=[[]])
> {code}
> Other cases when plan has outer join or set operators some branches can be 
> replaced with empty values moving forward in some cases the join/set operator 
> can be removed
> {code:java}
> select a2, b2 from t2 where 1=0
> union
> select a1, b1 from t1
> {code}
> {code:java}
> HiveAggregate(group=[{0, 1}])
>   HiveTableScan(table=[[default, t1]], table:alias=[t1])
> {code}



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