[LUCENE-3518] Add sort-by-term with DocValues

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0-ALPHA
• Component/s: core/search
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 14/Oct/11 10:31
• Updated: 28/Aug/22 12:59
• Resolved: 13/Nov/11 15:26

Description

There are two sorted byte[] types with DocValues (BYTES_VAR_SORTED,
BYTES_FIXED_SORTED), so you can index this type, but you can't yet
sort by it.

So I added a FieldComparator just like TermOrdValComparator, except it
pulls from the doc values instead.

There are some small diffs, eg with doc values there are never null
values (see LUCENE-3504).

Issue Links

• is blocked by: LUCENE-3524 Add "direct" PackedInts.Reader impl, that reads directly from disk on each get