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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20252) Semijoin Reduction : Cycles due to semi join branch may remain undetected if small table side has a map join upstream.
Date Fri, 27 Jul 2018 12:36:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559686#comment-16559686
] 

Hive QA commented on HIVE-20252:
--------------------------------

| (x) *{color:red}-1 overall{color}* |
\\
\\
|| 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}  8m 11s{color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  8s{color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 39s{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 2296 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  0s{color} |
{color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 25s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  8s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  8s{color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 44s{color} | {color:red}
ql: The patch generated 7 new + 34 unchanged - 7 fixed = 41 total (was 41) {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}  4m 15s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  0s{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} 24m 14s{color} | {color:black}
{color} |
\\
\\
|| 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-12896/dev-support/hive-personality.sh
|
| git revision | master / 94ec368 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-12896/yetus/diff-checkstyle-ql.txt
|
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-12896/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Semijoin Reduction : Cycles due to semi join branch may remain undetected if small table
side has a map join upstream.
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-20252
>                 URL: https://issues.apache.org/jira/browse/HIVE-20252
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>         Attachments: HIVE-20252.1.patch
>
>
> For eg,
>  {noformat}
>  # 2018-07-26T17:22:14,664 DEBUG [51377701-dc98-424f-82e0-bbb5d6c84316 main] optimizer.SharedWorkOptimizer:
Before SharedWorkOptimizer:
>  # TS[0]-FIL[96]-SEL[2]-MAPJOIN[156]-MAPJOIN[157]-MAPJOIN[161]-MAPJOIN[162]-FIL[47]-SEL[48]-MAPJOIN[163]-FIL[66]-SEL[67]-TNK[105]-GBY[68]-RS[69]-GBY[70]-SEL[71]-RS[72]-SEL[73]-LIM[74]-FS[75]
>  #                                                        
  -SEL[142]-GBY[143]-RS[144]-GBY[145]-RS[155]
>  # TS[3]-FIL[97]-SEL[5]-RS[34]-MAPJOIN[156]
>  # TS[6]-FIL[98]-SEL[8]-RS[37]-MAPJOIN[157]
>  # TS[9]-FIL[99]-SEL[11]-MAPJOIN[158]-GBY[40]-RS[42]-MAPJOIN[161]
>  # TS[12]-FIL[100]-SEL[14]-RS[16]-MAPJOIN[158]
>  #                       -SEL[131]-GBY[132]-EVENT[133]
>  # TS[19]-FIL[101]-SEL[21]-MAPJOIN[159]-GBY[29]-RS[30]-GBY[31]-SEL[32]-RS[45]-MAPJOIN[162]
>  # TS[22]-FIL[102]-SEL[24]-RS[26]-MAPJOIN[159]
>  #                       -SEL[139]-GBY[140]-EVENT[141]
>  # TS[49]-FIL[103]-SEL[51]-MAPJOIN[160]-GBY[59]-RS[60]-GBY[61]-SEL[62]-RS[64]-MAPJOIN[163]
>  # TS[52]-FIL[104]-SEL[54]-RS[56]-MAPJOIN[160]
>  #                       -SEL[147]-GBY[148]-EVENT[149]
>  # 
>  # 
>  # DPP information stored in the cache: \{TS[19]=[EVENT[141]], TS[9]=[EVENT[133]], TS[49]=[RS[155],
EVENT[149]]}
> {noformat}
>  
> The semi join branch in line 3 feeds into TS[49] in line 12 which feeds to MAPJOIN[163]
going back to parent of the semi join branch at line 2.
> The logic to detect cycle may fail as there is a MAPJOIN[160] at line 12 which could
cause the logic to look for wrong TS. The logic to find TS operator upstream must use findOperatorsUpstream()
and examine each TS Op for complete coverage.
>  
> cc [~jcamachorodriguez]



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