Adrien Grand created LUCENE-7501:

             Summary: Do not encode the split dimension in the index in the 1D 
                 Key: LUCENE-7501
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
            Priority: Minor

When there is a single dimension, the split dimension is always 0, so we do not 
need to encode it in the index of the BKD tree. This would be 33% memory saving 
for half floats, 20% for ints/floats, 11% for longs/doubles and 6% for ip 

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