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https://issues.apache.org/jira/browse/SOLR-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929401#action_12929401
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Toke Eskildsen commented on SOLR-792:
-------------------------------------
The current interface does not allow for nested queries. It is my understanding
that this limits the functionality to conventional hierarchical faceting with
the slight twist that the counts are for the current level instead of current
level + sub levels, but that should be attainable with conventional
hierarchical faceting too. This makes current pivot faceting a sub-set of
SOLR-64, provided that SOLR-64 is adjusted to accept a list of fields as
building blocks instead of expressing the hierarchy in a single field with
delimiters. This is a good thing. It means that it can be done fast and
memory-efficient as well as sharing most of the interface and output format
with SOLR-64.
Now, if something like nested queries is introduced in the pivot faceting
interface, this changes the requirements of the underlying code as a complete
recount is needed for each level. One evil nested query could be "Select the
documents where field X contains the last letter of the current tag plus the
first letter of the original query". This makes it hard (I try and avoid using
the word "impossible") to create an implementation without query-explosion.
So where am I going with all this? My point is that the interface (of course)
dictates how responsive the implementation can be. Focusing on interfaces and
using small-scale test data does carry a risk of ending up with something that
is inherently slow. It might be unfeasible to attain high scalability with a
given interface addition and that is okay - as long as that cost is known and
accepted. Hence my questions about scale and my musings about how to do it
faster.
> Pivot (ie: Decision Tree) Faceting Component
> --------------------------------------------
>
> Key: SOLR-792
> URL: https://issues.apache.org/jira/browse/SOLR-792
> Project: Solr
> Issue Type: New Feature
> Reporter: Erik Hatcher
> Assignee: Yonik Seeley
> Priority: Minor
> Attachments: SOLR-792-as-helper-class.patch,
> SOLR-792-PivotFaceting.patch, SOLR-792-PivotFaceting.patch,
> SOLR-792-PivotFaceting.patch, SOLR-792-PivotFaceting.patch,
> SOLR-792-raw-type.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch,
> SOLR-792.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch
>
>
> A component to do multi-level faceting.
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