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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20523) Improve table statistics for Parquet format
Date Sun, 23 Sep 2018 21:07:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625256#comment-16625256
] 

Hive QA commented on HIVE-20523:
--------------------------------

| (/) *{color:green}+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  1s{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 44s{color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  1s{color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 41s{color}
| {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  3m 50s{color} | {color:blue}
ql in master has 2326 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 55s{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  0s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  0s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 37s{color}
| {color:green} ql: The patch generated 0 new + 5 unchanged - 1 fixed = 5 total (was 6) {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} findbugs {color} | {color:green}  3m 58s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 55s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 13s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 22m 47s{color} | {color:black}
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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_PreCommit-HIVE-Build-14006/dev-support/hive-personality.sh
|
| git revision | master / 0f7163f |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-14006/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Improve table statistics for Parquet format
> -------------------------------------------
>
>                 Key: HIVE-20523
>                 URL: https://issues.apache.org/jira/browse/HIVE-20523
>             Project: Hive
>          Issue Type: Improvement
>          Components: Physical Optimizer
>            Reporter: George Pachitariu
>            Assignee: George Pachitariu
>            Priority: Minor
>         Attachments: HIVE-20523.1.patch, HIVE-20523.2.patch, HIVE-20523.patch
>
>
> Right now, in the table basic statistics, the *raw data size* for a row with any data
type in the Parquet format is 1. This is an underestimated value when columns are complex
data structures, like arrays.
> Having tables with underestimated raw data size makes Hive assign less containers (mappers/reducers)
to it, making the overall query slower. 
> Heavy underestimation also makes Hive choose MapJoin instead of the ShuffleJoin that
can fail with OOM errors.
> In this patch, I compute the columns data size better, taking into account complex structures.
I followed the Writer implementation for the ORC format.



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