Michael McCandless created LUCENE-7121:
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Summary: BKDWriter should not store ords when documents are single
valued
Key: LUCENE-7121
URL: https://issues.apache.org/jira/browse/LUCENE-7121
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: master, 6.1
Since we now have stats for points fields, it's easy to know up front whether
the field you are about to build a BKD tree for is single valued or not.
If it is single valued, we can optimize space by not storing the ordinal to
identify a point, since its docID also uniquely identifies it.
This saves 4 bytes per point, which for the 1D case is non-trivial (12 bytes
down to 8 bytes per doc), and even for the 2D case is good reduction (16 bytes
down to 12 bytes per doc).
This is an optimization ... I won't push it into 6.0.
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