| [smila-dev] search record: group by vs. faceting |
Hi folks, We are planning to integrate the solr 3.5 release into smila (hopefully for 1.1 when the CQs come thru) and are going to add/use a new group-by/field collapsing queries (http://wiki.apache.org/solr/FieldCollapsing). As a consequence I propose to the following change to our http://wiki.eclipse.org/SMILA/Documentation/Search#Query_Parameters groupby: only used for real group by functionality such as the mentioned query or clustering (http://search.carrot2.org/stable/search) faceting: used for faceting the key difference between the two are: - group by will contain for each value the results as nested result items - faceting will just report counts but no IDs per value The exact behavior (support for multiple group by fields)and capabilities will depend on the used implementation. Hence, we need a new result structure for the group by feature. I propose this: · The records-Seq map results is empty/ becomes nested to the group by value(s) · The example below shows a case where on groups by multiple fields (not supported by solr) <Val key="query">tv</Val> <Seq key="groupby"> <Map> <Val key="attribute">type</Val> <Val key="maxcount" type="long">10</Val> ... </Map> <Map> <Val key="attribute">size</Val> <Val key="maxcount" type="long">10</Val> ... </Map> </Seq> <Val key="query">tv</Val> <Map key="groups"> <!-- there is one map for each (existing) value of type --> <Map key="LED"> <!-- optionally subesequent fields are nested --> <Map key="32"> <!-- each leaf group field contains the results for the group --> <Seq key="results"> ... </Seq> </Map> <Map key="40"> <Seq key="results"> ... </Seq> </Map> </Map> <Map key="Plasma"> <Map key="32"> <Seq key="results"> ... </Seq> </Map> <Map key="40"> <Seq key="results"> ... </Seq> </Map> </Map> </Map> Faceting will remain as it is defined in wiki except that · definition happens via facet <Seq key="facet"> · result is returned in <Map key="facet_results"> OR (more analogous to groupby/groups) · definition happens via facet <Seq key="facetby"> · result is returned in <Map key="facets"> I realize this is a breaking change in regard to how the search record needs to be filled but I also think that this approach is more concise. Anyhow, tell me your thoughts. Thomas Menzel @ brox IT-Solutions GmbH Taglocity Tags: smila |