Nick Knize created LUCENE-9149:
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Summary: Increase data dimension limit in BKD
Key: LUCENE-9149
URL: https://issues.apache.org/jira/browse/LUCENE-9149
Project: Lucene - Core
Issue Type: Improvement
Reporter: Nick Knize
LUCENE-8496 added selective indexing; the ability to designate the first K <= N
dimensions for driving the construction of the BKD internal nodes. Follow on
work stored the "data dimensions" for only the leaf nodes and only the "index
dimensions" are stored for the internal nodes. While {{maxPointsInLeafNode}} is
still important for managing the BKD heap memory footprint (thus we don't want
this to get too large), I'd like to propose increasing the {{MAX_DIMENSIONS}}
limit (to something not too crazy like 16; effectively doubling the index
dimension limit) while maintaining the {{MAX_INDEX_DIMENSIONS}} at 8.
Doing this will enable us to encode higher dimension data within a lower
dimension index (e.g., 3D tessellated triangles as a 10 dimension point using
only the first 6 dimensions for index construction)
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