fix null handling for arithmetic post aggregator comparator#9159

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jon-wei merged 2 commits intoapache:masterfrom

clintropolis:post-agg-null-friendly-comparators

Jan 10, 2020

Commits on Jan 9, 2020

fix null handling for arithmetic postagg comparator, add test for comparator for min/max/quantile postaggs in histogram ext
clintropolis
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clintropolis
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