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https://issues.apache.org/jira/browse/LUCENE-7673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15850343#comment-15850343
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David Smiley commented on LUCENE-7673:
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+1 this looks nice Tomás. It'd be nice if {{DoubleValueSource}} and
{{LongValueSource}} in Lucene core (recently added by [~romseygeek]) would also
gain this ability but that can be a separate issue.
> Add MultiValued[Int/Long/Float/Double]FieldSource for SortedNumericDocValues
> ----------------------------------------------------------------------------
>
> Key: LUCENE-7673
> URL: https://issues.apache.org/jira/browse/LUCENE-7673
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Tomás Fernández Löbbe
> Assignee: Tomás Fernández Löbbe
> Attachments: LUCENE-7673.patch
>
>
> Right now \[Int/Long/Float/Double\]FieldSource can give a {{ValueSource}}
> view of a {{NumericDocValues}} field. This Jira is to add
> MultiValued\[Int/Long/Float/Double\]FieldSource that given a
> {{SortedNumericSelector.Type}} can give a {{ValueSource}} view of a
> {{SortedNumericDocValues}} field
> I considered instead of adding new classes an optional selector parameter to
> the existing \[Int/Long/Float/Double\]FieldSource, but I think adding
> different classes makes a cleaner API and it’s clear that for MultiValued*
> case, the selector is a mandatory parameter.
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