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Improve patternsel() by applying the operator itself to each value
listed in the column's most-common-values statistics entry. This givesus an exact selectivity result for the portion of the column populationrepresented by the MCV list, which can be a big leg up in accuracy ifthat's a large fraction of the population. The heuristics involvingpattern contents and prefix are applied only to the part of the populationnot included in the MCV list.1 parentad24b8e commitce8fd39
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