Description
This ticket introduces the CollapsingQParserPlugin
The CollapsingQParserPlugin is a PostFilter that performs field collapsing. This is a high performance alternative to standard Solr field collapsing (with ngroups) when the number of distinct groups in the result set is high.
For example in one performance test, a search with 10 million full results and 1 million collapsed groups:
Standard grouping with ngroups : 17 seconds.
CollapsingQParserPlugin: 300 milli-seconds.
Sample syntax:
Collapse based on the highest scoring document:
fq=(!collapse field=<field_name>}
Collapse based on the min value of a numeric field:
fq={!collapse field=<field_name> min=<field_name>}
Collapse based on the max value of a numeric field:
fq={!collapse field=<field_name> max=<field_name>}
Collapse with a null policy:
fq={!collapse field=<field_name> nullPolicy=<null_policy>}
There are three null policies:
ignore : removes docs with a null value in the collapse field (default).
expand : treats each doc with a null value in the collapse field as a separate group.
collapse : collapses all docs with a null value into a single group using either highest score, or min/max.
The CollapsingQParserPlugin also fully supports the QueryElevationComponent
Note: The July 16 patch also includes and ExpandComponent that expands the collapsed groups for the current search result page. This functionality will be moved to it's own ticket.
Attachments
Attachments
Issue Links
- is broken by
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SOLR-5416 CollapsingQParserPlugin breaks Tag/Exclude Faceting
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- Resolved
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- is related to
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- Resolved
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SOLR-5045 Pluggable Analytics
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- Resolved
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- relates to
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- Closed
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- Closed
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- Closed
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1.
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Ordering Issue when Collapsing using min max |
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Closed | Unassigned |