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https://issues.apache.org/jira/browse/SOLR-3076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703080#comment-13703080
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Mikhail Khludnev commented on SOLR-3076:
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bq. 2. How would Solr block join compare with Elasticsearch "nested types"? ...
ElasticSearch also provides some sort of "nested facets". However, I found them
useless for real life eCommerce faceting. Though, internally ES has enough
infrastructure to provide correct item level faceting. I feel it can be
delivered there easily. It's worth to clarify what I mean in "real life
eCommerce faceting", just check any site: if we have colored items which are
nested into top-level products, and when we count item level facets eg color,
we need to count number of *products* which has any items of the particular
color and passed item level filter eg size.
also desired direction is relations schema, see discussion in the beginning,
I'm not sure how ElasticSearch address it.
bq. 3. Can individual child documents be updated,...
you can only delete. I mean, you should be able to do so, but I don't remember
whether it's covered by test or not. Update,Replace,Append might be possible
only after "stacked updates" are there (frankly speaking, never).
> 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
> Assignee: Yonik Seeley
> Fix For: 5.0, 4.4
>
> 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-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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