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https://issues.apache.org/jira/browse/SOLR-6330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088343#comment-14088343
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Hoss Man commented on SOLR-6330:
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Spinning this issue off from SOLR-2894, where it was decided that this
shouldn't block distributed support being added to pivot faceting and can be
addressed later as needed.
the PivotFacetValue class (added in SOLR-2894) has a comment referring to this
issue ("SOLR-6330") pointing at the likley starting point to address this
problem in pivot facet refinement if/when we have the method(s) needed from the
FieldType API.
> distributed pivot faceting may not work well with some custom FieldTypes
> ------------------------------------------------------------------------
>
> Key: SOLR-6330
> URL: https://issues.apache.org/jira/browse/SOLR-6330
> Project: Solr
> Issue Type: Bug
> Reporter: Hoss Man
> Priority: Minor
>
> A limitiation of the distributed pivot faceting code is that it makes some
> explicit assumptions about the datatypes of the pivot values for the purposes
> of "serializing" the values in order to make refinement requests to the
> individual shards for those values.
> This logic works fine for String based fields, dates, and primitive numerics
> -- but any custom FieldType that has a {{toObject()}} method which does not
> return one of those data types may have problems. While pivot faceting uses
> the typed objects returned by {{toObject()}} in it's responses, there is no
> general FieldType method for converting those objects back into Strings
> suitable for the refinement requests.
> Untill we have some abstract, FieldType based, method for converting the
> value Objects into Strings thta can be included in the refinement requests
> for use in {{FieldType.getFieldQuery()}} there isn't really a good solution
> for this.
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