const FILTER_SLICES_SELECTIVITY_THRESHOLD: f64 = 0.8;Expand description
If the filter selects more than this fraction of rows, use
SlicesIterator to copy ranges of values. Otherwise iterate
over individual rows using IndexIterator
Threshold of 0.8 chosen based on https://dl.acm.org/doi/abs/10.1145/3465998.3466009