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https://issues.apache.org/jira/browse/HIVE-12369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16437300#comment-16437300
 ] 

Hive QA commented on HIVE-12369:
--------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
0s{color} | {color:blue} Findbugs executables are not available. {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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
44s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
11s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 
55s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  3m 
25s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  8m 
10s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m  
8s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  8m 
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  7m  
5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  7m  
5s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  2m 
23s{color} | {color:red} root: The patch generated 320 new + 1088 unchanged - 
51 fixed = 1408 total (was 1139) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
48s{color} | {color:red} ql: The patch generated 288 new + 356 unchanged - 42 
fixed = 644 total (was 398) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
13s{color} | {color:red} vector-code-gen: The patch generated 32 new + 307 
unchanged - 9 fixed = 339 total (was 316) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  
2s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  8m  
7s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
14s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 55m 32s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Optional Tests |  asflicense  javac  javadoc  findbugs  checkstyle  compile  
xml  |
| 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-10184/dev-support/hive-personality.sh
 |
| git revision | master / 6f9090c |
| Default Java | 1.8.0_111 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-10184/yetus/diff-checkstyle-root.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-10184/yetus/diff-checkstyle-ql.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-10184/yetus/diff-checkstyle-vector-code-gen.txt
 |
| modules | C: common . ql vector-code-gen U: . |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-10184/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Native Vector GroupBy
> ---------------------
>
>                 Key: HIVE-12369
>                 URL: https://issues.apache.org/jira/browse/HIVE-12369
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: HIVE-12369.01.patch, HIVE-12369.02.patch, 
> HIVE-12369.05.patch, HIVE-12369.06.patch, HIVE-12369.091.patch, 
> HIVE-12369.094.patch
>
>
> Implement Native Vector GroupBy using fast hash table technology developed 
> for Native Vector MapJoin, etc.
> Patch is currently limited to a single Long key with a single COUNT 
> aggregation.  Or, a single Long key and no aggregation also known as 
> duplicate reduction.
> 3 new classes introduces that stored the count in the slot table and don't 
> allocate hash elements:
> {noformat}
>   COUNT(column)  VectorGroupByHashLongKeyCountColumnOperator      
>   COUNT(key)     VectorGroupByHashLongKeyCountKeyOperator            
>   COUNT(*)       VectorGroupByHashLongKeyCountStarOperator           
> {noformat}
> And the duplicate reduction operator a single Long key:
> {noformat}
>   VectorGroupByHashLongKeyDuplicateReductionOperator
> {noformat}



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