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