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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5178) doc values should allow configurable defaults
Date Fri, 16 Aug 2013 01:27:52 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741786#comment-13741786
] 

Robert Muir commented on LUCENE-5178:
-------------------------------------

I dont think lucene needs to do anything here. As i explained on LUCENE-5177 (but you refused
to listen), you just have a separate numericdocvalues field just like fieldcache does (it
has a separate bitset).

So you write a 1 there, when the document has a value for the field. Otherwise it will contain
a 0 (because it gets filled with that).

This is very easy to do and will use ~ 1 bit per document just like fieldcache.

Then its just a matter of making it easy to pass this NumericDV to FIeldComparator (currently:
it always pulls a Bits directly from FC). this can be something like:
{code}
if (ndv instanceof Bits) { // codec already specializes here
  docsWithField = (Bits) ndv;
} else {
  docsWithField = new Bits() {
    boolean get(int index) {
      return ndv.get(index) != 0;
    }
}
{code}

                
> doc values should allow configurable defaults
> ---------------------------------------------
>
>                 Key: LUCENE-5178
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5178
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Yonik Seeley
>
> DocValues should somehow allow a configurable default per-field.
> Possible implementations include setting it on the field in the document or registration
of an IndexWriter callback.
> If we don't make the default configurable, then another option is to have DocValues fields
keep track of whether a value was indexed for that document or not.

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