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https://issues.apache.org/jira/browse/SOLR-5027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13810924#comment-13810924
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David commented on SOLR-5027:
-----------------------------
Here is an example query where i'm getting the error:
/productQuery?fq=discontinued:false&fq={!tag=manufacturer_string}manufacturer_string:("delta"%20OR%20"kohler")&fq=siteid:82&sort=score%20desc&facet=true&facet.mincount=1&facet.sort=index&start=0&rows=48&fl=productid,manufacturer,uniqueFinish,uniqueid,productCompositeid,score&facet.query={!ex=onSale}onSale:true&facet.query={!ex=rating}rating:[4%20TO%20*]&facet.query={!ex=rating}rating:[3%20TO%20*]&facet.query={!ex=rating}rating:[2%20TO%20*]&facet.query={!ex=rating}rating:[1%20TO%20*]&facet.query={!ex=MadeinAmerica_boolean}MadeinAmerica_boolean:yes&facet.query={!ex=inStock}inStock:true&facet.query={!ex=PulloutSpray_string}PulloutSpray_string:yes&facet.query={!ex=HandlesIncluded_string}HandlesIncluded_string:yes&facet.query={!ex=Electronic_string}Electronic_string:yes&facet.query={!ex=FlowRateGPM_numeric}FlowRateGPM_numeric:[0%20TO%201]&facet.query={!ex=FlowRateGPM_numeric}FlowRateGPM_numeric:[1%20TO%202]&facet.query={!ex=FlowRateGPM_numeric}FlowRateGPM_numeric:[2%20TO%203]&facet.query={!ex=FlowRateGPM_numeric}FlowRateGPM_numeric:[4%20TO%205]&facet.query={!ex=FlowRateGPM_numeric}FlowRateGPM_numeric:[3%20TO%204]&facet.query={!ex=FlowRateGPM_numeric}FlowRateGPM_numeric:[5%20TO%20*]&facet.query={!ex=ADA_string}ADA_string:yes&facet.query={!ex=WaterSenseCertified_string}WaterSenseCertified_string:yes&facet.query={!ex=WaterfallFaucet_boolean}WaterfallFaucet_boolean:yes&facet.query={!ex=InstallationAvailable_string}InstallationAvailable_string:yes&facet.query={!ex=LowLeadCompliant_string}LowLeadCompliant_string:yes&facet.query={!ex=DrainAssemblyIncluded_string}DrainAssemblyIncluded_string:yes&facet.query={!ex=EscutcheonIncluded_string}EscutcheonIncluded_string:yes&facet.field=NumberOfHandles_numeric&facet.field=pricebook_1_fs&facet.field=SpoutReach_numeric&facet.field=SpoutHeight_numeric&facet.field=FaucetCenters_numeric&facet.field=OverallHeight_numeric&facet.field=FaucetHoles_numeric&facet.field=HandleStyle_string&facet.field=masterFinish_string&facet.field={!ex=manufacturer_string}manufacturer_string&facet.field=HandleMaterial_string&facet.field=ValveType_string&facet.field=Theme_string&facet.field=MountingType_string&qt=/productQuery&qf=sku^9.0%20upc^9.1%20keywords_82_txtws^1.9%20uniqueid^9.0%20series^2.8%20productTitle^1.2%20productid^9.0%20manufacturer^4.0%20masterFinish^1.5%20theme^1.1%20categoryNames_82_txt^0.2%20finish^1.4&pf=keywords_82_txtws^2.1%20productTitle^1.5%20manufacturer^4.0%20finish^1.9&bf=linear(popularity_82_i,1,2)^3.0&q.alt=categories_82_is:108503
> Field Collapsing PostFilter
> ---------------------------
>
> Key: SOLR-5027
> URL: https://issues.apache.org/jira/browse/SOLR-5027
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 5.0
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 4.6, 5.0
>
> Attachments: SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch,
> SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch, SOLR-5027.patch,
> SOLR-5027.patch, SOLR-5027.patch
>
>
> 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:
> {code}
> fq=(!collapse field=<field_name>}
> {code}
> Collapse based on the min value of a numeric field:
> {code}
> fq={!collapse field=<field_name> min=<field_name>}
> {code}
> Collapse based on the max value of a numeric field:
> {code}
> fq={!collapse field=<field_name> max=<field_name>}
> {code}
> Collapse with a null policy:
> {code}
> fq={!collapse field=<field_name> nullPolicy=<null_policy>}
> {code}
> 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.
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