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https://issues.apache.org/jira/browse/SOLR-4329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591295#comment-13591295
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David Smiley commented on SOLR-4329:
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One more thing... as part of looking over DocumentBuilder with a fine toothed
comb, I noticed that schema.getCopyFieldsList(ifield.getName()) was being
called for *every* field value. This method internally has to do a bunch of
pattern matching to build up a list. Quite wasteful. I simply moved this out
of the loop. Another optimization that could be added is internal to that
method implementation -- return Collections.EMPTY_LIST if there are no copy
fields, instead of constructing an ArrayList.
> Have DocumentBuilder give value collections to the FieldType
> ------------------------------------------------------------
>
> Key: SOLR-4329
> URL: https://issues.apache.org/jira/browse/SOLR-4329
> Project: Solr
> Issue Type: New Feature
> Components: update
> Reporter: David Smiley
> Assignee: David Smiley
> Attachments: DocumentBuilder.java
>
>
> I'd like to write a multi-value-configured FieldType that can return a
> DocValue Field from its createFields(). Since DocValues holds a single value
> per document for a field, you can only have one. However
> FieldType.createFields() is invoked by the DocumentBuilder once per each
> value being indexed.
> FYI the reason I'm asking for this is for a multi-valued spatial field to
> store its points in DocValues.
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