[jira] Updated: (SOLR-1682) Implement CollapseComponent

["Yonik Seeley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yonik Seeley updated SOLR-1682:
-------------------------------

    Attachment: SOLR-1682.patch

I'm getting back to grouping/collapsing... here's a development patch.  I cleaned up a bunch of stuff, took a shot at coming up with a good HTTP API and response format, and enabled multiple field groupings in the same request.

HTTP params:
  group=true/false (like faceting, turn on/off grouping)
  group.query=<the query>  - this is analogous to facet.query, but currently not implemented
  group.field=<the field> - group by a field
  group.func=<the function> - group by a function
  group.limit - the top number of groups to report back (default is equal to the normal "limit" param, or 1 if unspecified)
  group.docsPerGroup - the top number of documents per group to return

We'll need to be able to specify some of these per group.  That hasn't been implemented, but utilizing local params seems natural (since the alternate f.<fieldname>.param method only works well with fields).

The "docsPerGroup" name seems a little more verbose than normal - anyone have shorter ideas?  Perhaps some kind of limit/offset params for the docs in a group.

Here's an example of the current API:
http://localhost:8983/solr/select?wt=json&indent=true&q=*:*&fl=id&rows=3&group=true&group.docsPerGroup=2&group.field=popularity&group.func=add%28popularity,popularity%29
{code}
{
  "responseHeader":{
    "status":0,
    "QTime":2,
    "params":{
      "fl":"id",
      "indent":"true",
      "q":"*:*",
      "group.field":"popularity",
      "group.func":"add(popularity,popularity)",
      "group.docsPerGroup":"2",
      "group":"true",
      "wt":"json",
      "rows":"3"}},
  "grouped":{
    "popularity":{
      "groups":[{
          "groupValue":6,
          "matches":5,
          "docs":{"numFound":5,"start":0,"docs":[
              {
                "id":"SP2514N"},
              {
                "id":"6H500F0"}]
          }},
        {
          "groupValue":1,
          "matches":2,
          "docs":{"numFound":2,"start":0,"docs":[
              {
                "id":"F8V7067-APL-KIT"},
              {
                "id":"IW-02"}]
          }},
        {
          "groupValue":10,
          "matches":2,
          "docs":{"numFound":2,"start":0,"docs":[
              {
                "id":"MA147LL/A"},
              {
                "id":"SOLR1000"}]
          }}]},
    "add(popularity,popularity)":{
      "groups":[{
          "groupValue":12.0,
          "matches":5,
          "docs":{"numFound":5,"start":0,"docs":[
              {
                "id":"SP2514N"},
              {
                "id":"6H500F0"}]
          }},
        {
          "groupValue":2.0,
          "matches":2,
          "docs":{"numFound":2,"start":0,"docs":[
              {
                "id":"F8V7067-APL-KIT"},
              {
                "id":"IW-02"}]
          }},
        {
          "groupValue":20.0,
          "matches":2,
          "docs":{"numFound":2,"start":0,"docs":[
              {
                "id":"MA147LL/A"},
              {
                "id":"SOLR1000"}]
          }}]}}}
{code}


> Implement CollapseComponent
> ---------------------------
>
>                 Key: SOLR-1682
>                 URL: https://issues.apache.org/jira/browse/SOLR-1682
>             Project: Solr
>          Issue Type: Sub-task
>          Components: search
>            Reporter: Martijn van Groningen
>            Assignee: Shalin Shekhar Mangar
>             Fix For: Next
>
>         Attachments: field-collapsing.patch, SOLR-1682.patch, SOLR-1682.patch, SOLR-1682.patch, SOLR-1682_prototype.patch, SOLR-1682_prototype.patch, SOLR-1682_prototype.patch, SOLR-236.patch
>
>
> Child issue of SOLR-236. This issue is dedicated to field collapsing in general and all its code (CollapseComponent, DocumentCollapsers and CollapseCollectors). The main goal is the finalize the request parameters and response format.

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