[ 
https://issues.apache.org/jira/browse/SOLR-13717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920927#comment-16920927
 ] 

Lucene/Solr QA commented on SOLR-13717:
---------------------------------------

| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m 
26s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m 
53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Release audit (RAT) {color} | 
{color:green}  2m 53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Check forbidden APIs {color} | 
{color:green}  2m 53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Validate source patterns {color} | 
{color:green}  2m 53s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 58m  
0s{color} | {color:green} core in the patch passed. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 68m 31s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | SOLR-13717 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12979151/SOLR-13717.patch |
| Optional Tests |  compile  javac  unit  ratsources  checkforbiddenapis  
validatesourcepatterns  |
| uname | Linux lucene2-us-west.apache.org 4.4.0-112-generic #135-Ubuntu SMP 
Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | ant |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-SOLR-Build/sourcedir/dev-tools/test-patch/lucene-solr-yetus-personality.sh
 |
| git revision | master / 1862ffd |
| ant | version: Apache Ant(TM) version 1.9.6 compiled on July 20 2018 |
| Default Java | LTS |
|  Test Results | 
https://builds.apache.org/job/PreCommit-SOLR-Build/544/testReport/ |
| modules | C: solr/core U: solr/core |
| Console output | 
https://builds.apache.org/job/PreCommit-SOLR-Build/544/console |
| Powered by | Apache Yetus 0.7.0   http://yetus.apache.org |


This message was automatically generated.



> Distributed Grouping breaks multi valued 'fl' param
> ---------------------------------------------------
>
>                 Key: SOLR-13717
>                 URL: https://issues.apache.org/jira/browse/SOLR-13717
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>            Priority: Major
>         Attachments: SOLR-13717.patch, SOLR-13717.patch
>
>
> Co-worker discovered a bug with (distributed) grouping when multiple {{fl}} 
> params are specified.
> {{StoredFieldsShardRequestFactory}} has very (old and) brittle code that 
> assumes there will be 0 or 1 {{fl}} params in the original request that it 
> should inspect to see if it needs to append (via string concat) the uniqueKey 
> field onto in order to collate the returned stored fields into their 
> respective (grouped) documents -- and then ignores any additional {{fl}} 
> params that may exist in the original request when it does so.
> The net result is that only the uniqueKey field and whatever fields _are_ 
> specified in the first {{fl}} param specified are fetched from each shard and 
> ultimately returned.
> The only workaround is to replace multiple {{fl}} params with a single {{fl}} 
> param containing a comma seperated list of the requested fields.
> ----
> Bug is trivial to reproduce with {{bin/solr -e cloud -noprompt}} by comparing 
> these requests which should all be equivilent...
> {noformat}
> $ bin/post -c gettingstarted -out yes example/exampledocs/books.csv
> ...
> $ curl 
> 'http://localhost:8983/solr/gettingstarted/query?omitHeader=true&indent=true&fl=author,name,id&q=*:*&group=true&group.field=genre_s'
> {
>   "grouped":{
>     "genre_s":{
>       "matches":10,
>       "groups":[{
>           "groupValue":"fantasy",
>           "doclist":{"numFound":8,"start":0,"maxScore":1.0,"docs":[
>               {
>                 "id":"0812521390",
>                 "name":["The Black Company"],
>                 "author":["Glen Cook"]}]
>           }},
>         {
>           "groupValue":"scifi",
>           "doclist":{"numFound":2,"start":0,"docs":[
>               {
>                 "id":"0553293354",
>                 "name":["Foundation"],
>                 "author":["Isaac Asimov"]}]
>           }}]}}}
> $ curl 
> 'http://localhost:8983/solr/gettingstarted/query?omitHeader=true&indent=true&fl=author&fl=name,id&q=*:*&group=true&group.field=genre_s'
> {
>   "grouped":{
>     "genre_s":{
>       "matches":10,
>       "groups":[{
>           "groupValue":"fantasy",
>           "doclist":{"numFound":8,"start":0,"maxScore":1.0,"docs":[
>               {
>                 "id":"0812521390",
>                 "author":["Glen Cook"]}]
>           }},
>         {
>           "groupValue":"scifi",
>           "doclist":{"numFound":2,"start":0,"docs":[
>               {
>                 "id":"0553293354",
>                 "author":["Isaac Asimov"]}]
>           }}]}}}
> $ curl 
> 'http://localhost:8983/solr/gettingstarted/query?omitHeader=true&indent=true&fl=id&fl=author&fl=name&q=*:*&group=true&group.field=genre_s'
> {
>   "grouped":{
>     "genre_s":{
>       "matches":10,
>       "groups":[{
>           "groupValue":"fantasy",
>           "doclist":{"numFound":8,"start":0,"maxScore":1.0,"docs":[
>               {
>                 "id":"0553573403"}]
>           }},
>         {
>           "groupValue":"scifi",
>           "doclist":{"numFound":2,"start":0,"docs":[
>               {
>                 "id":"0553293354"}]
>           }}]}}}
> {noformat}



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