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https://issues.apache.org/jira/browse/HIVE-22238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16962755#comment-16962755
]
Hive QA commented on HIVE-22238:
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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
1s{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} 1m
26s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m
25s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 7m
30s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 2m
43s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 4m
0s{color} | {color:blue} ql in master has 1545 extant Findbugs warnings.
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 7m
25s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
24s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 7m
16s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 7m
16s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
38s{color} | {color:red} ql: The patch generated 1 new + 93 unchanged - 0 fixed
= 94 total (was 93) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 1m
52s{color} | {color:red} root: The patch generated 1 new + 93 unchanged - 0
fixed = 94 total (was 93) {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m
0s{color} | {color:red} The patch has 6 line(s) that end in whitespace. Use git
apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply
{color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 4m
5s{color} | {color:red} ql generated 1 new + 1545 unchanged - 0 fixed = 1546
total (was 1545) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 7m
17s{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} 62m 7s{color} |
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:ql |
| | Unread field:AccurateEstimatesCheckerHook.java:[line 61] |
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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
3.16.43-2+deb8u5 (2017-09-19) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-19205/dev-support/hive-personality.sh
|
| git revision | master / 305e710 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.1 |
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-19205/yetus/diff-checkstyle-ql.txt
|
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-19205/yetus/diff-checkstyle-root.txt
|
| whitespace |
http://104.198.109.242/logs//PreCommit-HIVE-Build-19205/yetus/whitespace-eol.txt
|
| findbugs |
http://104.198.109.242/logs//PreCommit-HIVE-Build-19205/yetus/new-findbugs-ql.html
|
| modules | C: ql . itests U: . |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-19205/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> PK/FK selectivity estimation underscales estimations
> ----------------------------------------------------
>
> Key: HIVE-22238
> URL: https://issues.apache.org/jira/browse/HIVE-22238
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22238.01.patch, HIVE-22238.02.patch,
> HIVE-22238.03.patch, HIVE-22238.04.patch, HIVE-22238.05.patch,
> HIVE-22238.05.patch, HIVE-22238.05.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> at [this
> point|https://github.com/apache/hive/blob/5098d155a1e6a164253f5fa98755273bc34085df/ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java#L2182]
> the parent operators rownum is scaled according to pkfkselectivity
> however [pkfkselectivity is
> computed|https://github.com/apache/hive/blob/5098d155a1e6a164253f5fa98755273bc34085df/ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java#L2157]
> on a whole subtree.
> Scaling it by that amount will count in estimation already used when
> parentstats was calculated...so depending on the number of upstream joins -
> this may lead to severe underestimations
> what happened was:
> * optimization was able to push the filter to the other side of the join
> * as a result the incoming data was already filtered
> * scaling down by the PK selectiviy - was actually already there...but a new
> "scaling" happened
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