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https://issues.apache.org/jira/browse/SOLR-13717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16921644#comment-16921644
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Hoss Man commented on SOLR-13717:
---------------------------------
Gah, juggling too many tabs/issues at the same time.
Primary commits related to this issue...
* master: https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=83cd54f
** 83cd54f80157916b364bb5ebde20a66cbd5d3d93
* branch_8x: https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=86e8c44
** 86e8c44be472556c8a905deb338cafa803ee6ee0
> 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
> Fix For: master (9.0), 8.3
>
> 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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