Custom solr.TrieDateField collector

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Hi

I have a SOLR (4.7.1) tire DateField with dates. I would like to retrieve
the values of this field via a custom lucene collector. For String fields I
use the following pattern

BinaryDocValues field = FieldCache.DEFAULT.getTerms(ctx.reader(),
"entitledsites",false);


in setNextReader() method, and then use


BytesRef t = new BytesRef();

field.get(doc, t);

if (t.bytes != BytesRef.EMPTY_BYTES) {