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https://issues.apache.org/jira/browse/SOLR-3076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737385#comment-13737385
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Mikhail Khludnev commented on SOLR-3076:
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[~thetaphi] what is the reason of delaying this functionality, if we can
deliver it now with the following configuration "footprint"?
{code:xml}
<query>
<cache name="cachingWrapperFilterCache"
class="solr.search.LRUCache">
</query>
<queryParser name="parent" class="join.BlockJoinParentQParserPlugin">
<!-- if you omit this BJQ will perform "suboptimal",
thought functionally complete,
also it annoyingly warns -->
<str name="parent-filter-cache">cachingWrapperFilterCache</str>
</queryParser>
{code}
Broken Solr on segments seems crucial to me too.
I suppose that refactoring will take even much time than this modest piece of
functionality. I feel it's really challenging from design perspective e.g. can
CachingWrapperFilter flip between dense and sparse sets already? shouldn't it
use off-heap memory like in LUCENE-5052 rather than pollute the heap? whether
filters behavior is defined in index time or can be requested ad-hoc? etc
Once again, what about going ahead with small configuration footprint, without
diverging join queries.
thanks
> Solr(Cloud) should support block joins
> --------------------------------------
>
> Key: SOLR-3076
> URL: https://issues.apache.org/jira/browse/SOLR-3076
> Project: Solr
> Issue Type: New Feature
> Reporter: Grant Ingersoll
> Fix For: 4.5, 5.0
>
> Attachments: 27M-singlesegment-histogram.png, 27M-singlesegment.png,
> bjq-vs-filters-backward-disi.patch, bjq-vs-filters-illegal-state.patch,
> child-bjqparser.patch, dih-3076.patch, dih-config.xml,
> parent-bjq-qparser.patch, parent-bjq-qparser.patch, Screen Shot 2012-07-17 at
> 1.12.11 AM.png, SOLR-3076-childDocs.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-7036-childDocs-solr-fork-trunk-patched,
> solrconf-bjq-erschema-snippet.xml, solrconfig.xml.patch,
> tochild-bjq-filtered-search-fix.patch
>
>
> Lucene has the ability to do block joins, we should add it to Solr.
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