Buqian Zheng 25249fd26e
enhance: [2.4] add metrics for counting number of nun-zeros/tokens of sparse search (#38328)
sparse vectors may have arbitrary number of non zeros and it is hard to
optimize without knowing the actual distribution of nnz. this PR adds a
metric for analyzing that.

pr: #38329 

also fixed a bug of sparse when searching by pk

Signed-off-by: Buqian Zheng <zhengbuqian@gmail.com>
2024-12-11 10:00:43 +08:00
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