[jira] Commented: (LUCENE-2700) Expose DocValues via Fields

["Simon Willnauer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924895#action_12924895 ] 

Simon Willnauer commented on LUCENE-2700:
-----------------------------------------

bq. FunctionQuery already has a class called DocValues - perhaps we could call this one FieldValues?
Ah I must have missed this comment - sry for the late response. I think you are right that we should use a different name. Maybe PerDocValues since FieldValues is doesn't sound right to me though.

The other question is if FunctionQuery should be in core at all or if we should move it out to module (solr uses its own anyway right so we can merge them). Then the name similarity would not matter IMO. But thats a different story


> Expose DocValues via Fields
> ---------------------------
>
>                 Key: LUCENE-2700
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2700
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Simon Willnauer
>            Assignee: Simon Willnauer
>             Fix For: CSF branch
>
>
> DocValues Reader are currently exposed / accessed directly via IndexReader. To integrate the new feature in a more "native" way we should expose the DocValues via Fields on a perSegment level and on MultiFields in the multi reader case. DocValues should be side by side with Fields.terms  enabling access to Source, SortedSource and ValuesEnum something like that:
> {code}
> public abstract class Fields {
> ...
>   public DocValues values();
> }
> public abstract class DocValues {
>   /** on disk enum based API */
>   public abstract ValuesEnum getEnum() throws IOException;
>   /** in memory Random Access API - with enum support - first call loads values in ram*/
>   public abstract Source getSource() throws IOException;
>   /** sorted in memory Random Access API - optional operation */
>   public SortedSource getSortedSource(Comparator<BytesRef> comparator) throws IOException, UnsupportedOperationException;
>   /** unloads previously loaded source only but keeps the doc values open */
>   public abstract unload();
>   /** closes the doc values */
>   public abstract close();
> }
> {code}

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