perf: moarstats optimize non-streaming bivariate stats compilation
#3250
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Pull request overview
This PR optimizes the performance of non-streaming bivariate statistics computation in the moarstats command by replacing floating-point comparisons and improving memory allocation patterns.
Key changes:
- Replaced
partial_cmpwithtotal_cmpfor sorting and comparison operations in correlation coefficient calculations - Changed tie detection from EPSILON-based comparison to exact equality comparison
- Optimized memory allocation using pre-allocated vectors with
Vec::with_capacity+extend - Replaced element-by-element copying with
copy_from_slicefor better performance
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