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https://issues.apache.org/jira/browse/HIVE-20523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16748567#comment-16748567
]
Hive QA commented on HIVE-20523:
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| (/) *{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
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
47s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
58s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
35s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 3m
41s{color} | {color:blue} ql in master has 2310 extant Findbugs warnings.
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
54s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
19s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
1s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m
1s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
36s{color} | {color:green} ql: The patch generated 0 new + 10 unchanged - 4
fixed = 10 total (was 14) {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
53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
54s{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.
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| {color:black}{color} | {color:black} {color} | {color:black} 22m 26s{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_PreCommit-HIVE-Build-15729/dev-support/hive-personality.sh
|
| git revision | master / cb74a68 |
| 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-15729/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-20523.10.patch,
> HIVE-20523.11.patch, HIVE-20523.12.patch, HIVE-20523.2.patch,
> HIVE-20523.3.patch, HIVE-20523.4.patch, HIVE-20523.5.patch,
> HIVE-20523.6.patch, HIVE-20523.7.patch, HIVE-20523.8.patch,
> HIVE-20523.9.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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