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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-6609) FieldCacheSource (or it's subclasses) should override getSortField
Date Tue, 04 Aug 2015 00:24:05 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-6609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hoss Man resolved LUCENE-6609.
------------------------------
       Resolution: Fixed
    Fix Version/s: Trunk
                   5.3

> FieldCacheSource (or it's subclasses) should override getSortField
> ------------------------------------------------------------------
>
>                 Key: LUCENE-6609
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6609
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: 5.3, Trunk
>
>         Attachments: LUCENE-6609.patch
>
>
> {{ValueSource}} defines the following method...
> {code}
>   public SortField getSortField(boolean reverse) {
>     return new ValueSourceSortField(reverse);
>   }
> {code}
> ...where {{ValueSourceSortField}} builds up a {{ValueSourceComparator}} containing a
{{double[]}} based on the {{FunctionValues}} of the original {{ValueSource}}.
> meanwhile, the abstract {{FieldCacheSource}} exists as a base implementation for classes
like {{IntFieldSource}} and {{DoubleFieldSource}} which wrap a {{ValueSource}} around {{DocValues}}
for the specified field.
> But neither {{FieldCacheSource}} nor any of it's subclasses override the {{getSortField(boolean)}}
method -- so attempting to sort on something like an {{IntFieldSource}} winds up using a bunch
of ram to build that {{double[]}} to give users a less accurate sort (because of casting)
then if they just sorted directly on the field.
> is there any good reason why {{FieldCacheSource}} subclases like {{IntFieldSource}} shouldn't
all override {{getSortField}} with something like...
> {code}
>   public SortField getSortField(boolean reverse) {
>     return new SortField(field, Type.INT, reverse);
>   }
> {code}
> ?



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