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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18108) in case basic stats are missing; rowcount estimation depends on the selected columns size
Date Wed, 20 Dec 2017 16:14:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16298677#comment-16298677
] 

Hive QA commented on HIVE-18108:
--------------------------------

| (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:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m  5s{color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  3s{color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 34s{color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 53s{color} |
{color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 22s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  2s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  2s{color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 33s{color} | {color:red}
ql: The patch generated 1 new + 96 unchanged - 0 fixed = 97 total (was 96) {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} javadoc {color} | {color:green}  0m 52s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 12s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 13m 50s{color} | {color:black}
{color} |
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|| Subsystem || Report/Notes ||
| Optional Tests |  asflicense  javac  javadoc  findbugs  checkstyle  compile  |
| 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/dev-support/hive-personality.sh |
| git revision | master / 1c36983 |
| Default Java | 1.8.0_111 |
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-8338/yetus/diff-checkstyle-ql.txt
|
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-8338/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> in case basic stats are missing; rowcount estimation depends on the selected columns
size
> -----------------------------------------------------------------------------------------
>
>                 Key: HIVE-18108
>                 URL: https://issues.apache.org/jira/browse/HIVE-18108
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>         Attachments: HIVE-18108.01.patch, HIVE-18108.02wip02.patch
>
>
> in case basicstats are not available (especially rowcount):
> {code}
> set hive.stats.autogather=false;
> create table t (a integer, b string);
> insert into t values (1,'asd1');
> insert into t values (2,'asd2');
> insert into t values (3,'asd3');
> insert into t values (4,'asd4');
> insert into t values (5,'asd5');
> explain select a,count(1) from t group by a;
> -- estimated to read 8 rows from table t
> explain select b,count(1) from t group by b;
> -- estimated: 1 rows
> explain select a,b,count(1) from t group by a,b;
> -- estimated: 1 rows
> {code}
> it may not depend on the actually selected column set.



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