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https://issues.apache.org/jira/browse/SOLR-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935032#action_12935032
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Yonik Seeley commented on SOLR-2068:
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I just enabled and committed the code to collapse by string more efficiently
(after adding support for null values).
Here are the results of some quick tests.
index: docs=10M, segments=11
query=\*:\*
rows=10
|number of unique values in field.group|ms before patch|ms after patch|
|10|816|306|
|100|630|388|
|1000|612|367|
|10000|681|368|
|100000|995|436|
> Search Grouping: collapse by string specialization
> --------------------------------------------------
>
> Key: SOLR-2068
> URL: https://issues.apache.org/jira/browse/SOLR-2068
> Project: Solr
> Issue Type: Sub-task
> Reporter: Yonik Seeley
> Attachments: SOLR-2068.patch, SOLR-2068.patch, SOLR-2068.patch
>
>
> Create specialized implementations for collapsing by an indexed string field.
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