[
https://issues.apache.org/jira/browse/SOLR-4787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669372#comment-13669372
]
Kranti Parisa commented on SOLR-4787:
-------------------------------------
Hi Joel, idea looks really great. Is it too costly to implement this with
"long" instead of "integers"? with longs we can support bigger numbers which
could be part of the "key" fields.
please share your ideas.
> Join Contrib
> ------------
>
> Key: SOLR-4787
> URL: https://issues.apache.org/jira/browse/SOLR-4787
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 4.2.1
> Reporter: Joel Bernstein
> Priority: Minor
> Fix For: 4.2.1
>
> Attachments: SOLR-4787.patch, SOLR-4787.patch, SOLR-4787.patch,
> SOLR-4787.patch, SOLR-4787.patch, SOLR-4787.patch, SOLR-4787.patch
>
>
> This contrib provides a place where different join implementations can be
> contributed to Solr. This contrib currently includes 3 join implementations.
> The initial patch was generated from the Solr 4.2.1 tag. Because of changes
> in the FieldCache API this patch will only build with Solr 4.2 or above.
> *PostFilterJoinQParserPlugin aka "pjoin"*
> The pjoin provides a join implementation that filters results in one core
> based on the results of a search in another core. This is similar in
> functionality to the JoinQParserPlugin but the implementation differs in a
> couple of important ways.
> The first way is that the pjoin is designed to work with integer join keys
> only. So, in order to use pjoin, integer join keys must be included in both
> the to and from core.
> The second difference is that the pjoin builds memory structures that are
> used to quickly connect the join keys. It also uses a custom SolrCache named
> "join" to hold intermediate DocSets which are needed to build the join memory
> structures. So, the pjoin will need more memory then the JoinQParserPlugin to
> perform the join.
> The main advantage of the pjoin is that it can scale to join millions of keys
> between cores.
> Because it's a PostFilter, it only needs to join records that match the main
> query.
> The syntax of the pjoin is the same as the JoinQParserPlugin except that the
> plugin is referenced by the string "pjoin" rather then "join".
> fq=\{!pjoin fromCore=collection2 from=id_i to=id_i\}user:customer1
> The example filter query above will search the fromCore (collection2) for
> "user:customer1". This query will generate a list of values from the "from"
> field that will be used to filter the main query. Only records from the main
> query, where the "to" field is present in the "from" list will be included in
> the results.
> The solrconfig.xml in the main query core must contain the reference to the
> pjoin.
> <queryParser name="pjoin"
> class="org.apache.solr.joins.PostFilterJoinQParserPlugin"/>
> And the join contrib jars must be registed in the solrconfig.xml.
> <lib dir="../../../dist/" regex="solr-joins-\d.*\.jar" />
> The solrconfig.xml in the fromcore must have the "join" SolrCache configured.
> <cache name="join"
> class="solr.LRUCache"
> size="4096"
> initialSize="1024"
> />
> *JoinValueSourceParserPlugin aka vjoin*
> The second implementation is the JoinValueSourceParserPlugin aka "vjoin".
> This implements a ValueSource function query that can return values from a
> second core based on join keys. This allows relevance data to be stored in a
> separate core and then joined in the main query.
> The vjoin is called using the "vjoin" function query. For example:
> bf=vjoin(fromCore, fromKey, fromVal, toKey)
> This example shows "vjoin" being called by the edismax boost function
> parameter. This example will return the "fromVal" from the "fromCore". The
> "fromKey" and "toKey" are used to link the records from the main query to the
> records in the "fromCore".
> As with the "pjoin", both the fromKey and toKey must be integers. Also like
> the pjoin, the "join" SolrCache is used to hold the join memory structures.
> To configure the vjoin you must register the ValueSource plugin in the
> solrconfig.xml as follows:
> <valueSourceParser name="vjoin"
> class="org.apache.solr.joins.JoinValueSourceParserPlugin" />
> *JoinValueSourceParserPlugin2 aka vjoin2 aka Personalized ValueSource Join*
> vjoin2 supports "personalized" ValueSource joins. The syntax is similar to
> vjoin but adds an extra parameter so a query can be specified to join a
> specific record set from the fromCore. This is designed to allow customer
> specific relevance information to be added to the fromCore and then joined at
> query time.
> Syntax:
> bf=vjoin2(fromCore,fromKey,fromVal,toKey,query)
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org
For additional commands, e-mail: dev-h...@lucene.apache.org
