You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@calcite.apache.org by "Danny Chen (Jira)" <ji...@apache.org> on 2019/10/28 08:28:00 UTC

[jira] [Resolved] (CALCITE-3390) ITEM expression does not get pushed to the right input of left-outer-join

     [ https://issues.apache.org/jira/browse/CALCITE-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Danny Chen resolved CALCITE-3390.
---------------------------------
    Fix Version/s: 1.22.0
       Resolution: Fixed

Fixed in [a02155a|https://github.com/apache/calcite/commit/a02155a70a1fe98c8930a0060dc043902ebbd88f], thanks for your PR, [~amansinha100] !

> ITEM expression does not get pushed to the right input of left-outer-join
> -------------------------------------------------------------------------
>
>                 Key: CALCITE-3390
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3390
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.21.0
>            Reporter: Aman Sinha
>            Assignee: Aman Sinha
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.22.0
>
>          Time Spent: 6h 20m
>  Remaining Estimate: 0h
>
> In the following query, the ITEM expression above the Left Outer Join does not get pushed to the right input (null-preserving input) of the join whereas it should since ITEM does not change the nullability.  
> {noformat}
> explain plan without implementation for select tt7.columns[0], tt8.columns[0] as x from tt7 left outer join tt8  on tt7.columns[0] = tt8.columns[0];
>  DrillScreenRel
>   DrillProjectRel(EXPR$0=[$1], x=[ITEM($2, 0)])
>     DrillJoinRel(condition=[=($0, $3)], joinType=[left])
>       DrillProjectRel($f2=[ITEM($0, 0)], ITEM=[ITEM($0, 0)])
>         DrillScanRel(table=[[dfs, tmp, tt7]], groupscan=[EasyGroupScan [selectionRoot=file:/tmp/tt7, numFiles=1, columns=[`columns`[0]], files=[file:/tmp/tt7/0_0_0.csv]]])
>       DrillProjectRel(columns=[$0], $f2=[ITEM($0, 0)])
>         DrillScanRel(table=[[dfs, tmp, tt8]], groupscan=[EasyGroupScan [selectionRoot=file:/tmp/tt8, numFiles=1, columns=[`columns`, `columns`[0]], files=[file:/tmp/tt8/0_0_0.csv]]])
> {noformat}
> From what I can tell, the change in behavior occurred with CALCITE-1753; before that the ITEM was pushed on both sides of the Left Outer Join. 



--
This message was sent by Atlassian Jira
(v8.3.4#803005)