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0ded0ce414
* Add round support for DS-HLL Since the Cardinality aggregator has a "round" option to round off estimated values generated from the HyperLogLog algorithm, add the same "round" option to the DataSketches HLL Sketch module aggregators to be consistent. * Fix checkstyle errors * Change HllSketchSqlAggregator to do rounding * Fix test for standard-compliant null handling mode