Ignacio Vera created LUCENE-8562:
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Summary: Speed up merging segments of points with data dimensions
Key: LUCENE-8562
URL: https://issues.apache.org/jira/browse/LUCENE-8562
Project: Lucene - Core
Issue Type: Improvement
Components: core/index
Affects Versions: master (8.0), 7.7
Reporter: Ignacio Vera
Currently when merging segments of points with data dimensions, all dimensions
are sorted and carried over down the tree even though only indexing dimensions
are needed to build the BKD tree. This is needed so leaf node data can be
compressed by common prefix.
But when using _MutablePointValues_, this ordering is done at the leaf level so
we can se a similar approach from data dimensions and delay the sorting at leaf
level. This seems to speed up indexing time as well as reduce the storage
needed for building the index.
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