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https://issues.apache.org/jira/browse/SOLR-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar updated SOLR-1682:
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Attachment: SOLR-236.patch
Here's an implementation based on [Yonik's
suggestion|https://issues.apache.org/jira/browse/SOLR-236?focusedCommentId=12792916&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12792916].
This is just a PoC and not fit to be committed. This implementation uses one
pass for collapse.threshold=1 and two passes for collapse.threshold>1 so it
should be a lot faster than the previous method. Though, I haven't benchmarked
yet. Memory consumption should be proportional to start+count instead of index
size.
What is covered:
# Non-adjacent collapsing
# collapse.threshold
# [New response
format|https://issues.apache.org/jira/browse/SOLR-236?focusedCommentId=12793101&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12793101]
# Includes DocSetAwareCollector interface from SOLR-1680
What is not covered:
# Adjacent collapsing
# Aggregate functions (should be easy to add)
# Faceting (it doesn't keep/return the docsets needed for FacetComponent)
# Caching
# This implementation does not return the correct numFound
The response adds special fields to only the first document in a group. Here's
a sample of the first document in a group:
{code:xml}
<doc>
<int name="id">1</int>
<str name="name_s1">author1</str>
<str name="title_s1">a tree</str>
<date name="timestamp">2009-12-30T10:16:51.944Z</date>
<arr name="multiDefault">
<str>muLti-Default</str>
</arr>
<int name="intDefault">42</int>
<str name="collapse.value">author1</str>
<int name="collapse.count">1</int>
<float name="score">0.67107505</float>
</doc>
{code}
See TestCollapseComponent.java for example usage.
> 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: 1.5
>
> Attachments: field-collapsing.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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