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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17041) Aggregate elimination with UNIQUE and NOT NULL column
Date Mon, 17 Sep 2018 00:43:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16616965#comment-16616965
] 

Hive QA commented on HIVE-17041:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  0s{color} |
{color:green} The patch does not contain any @author tags. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  0s{color} | {color:red}
The patch has 13 line(s) that end in whitespace. Use git apply --whitespace=fix <<patch_file>>.
Refer https://git-scm.com/docs/git-apply {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 50s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}  1m 30s{color} | {color:black}
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|| Subsystem || Report/Notes ||
| Optional Tests |  asflicense  |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u1 (2016-09-03)
x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /data/hiveptest/working/yetus_PreCommit-HIVE-Build-13846/dev-support/hive-personality.sh
|
| git revision | master / a37827e |
| whitespace | http://104.198.109.242/logs//PreCommit-HIVE-Build-13846/yetus/whitespace-eol.txt
|
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-13846/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


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> Aggregate elimination with UNIQUE and NOT NULL column
> -----------------------------------------------------
>
>                 Key: HIVE-17041
>                 URL: https://issues.apache.org/jira/browse/HIVE-17041
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Logical Optimizer
>    Affects Versions: 3.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Vineet Garg
>            Priority: Major
>         Attachments: HIVE-17041.1.patch
>
>
> If columns are part of a GROUP BY expression and they are UNIQUE and do not accept NULL
values, i.e. PK or UK+NOTNULL, the _Aggregate_ operator can be transformed into a Project
operator, as each row will end up in a different group.
> For instance, given that _pk_ is the PRIMARY KEY for the table, the GROUP BY could be
removed from grouping columns for following query:
> {code:sql}
> SELECT pk, value1
> FROM table_1
> GROUP BY value1, pk, value2;
> {code}



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