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Review request for hive. Description ------- Fixes the FM estimator to use hash functions that are pairwise independent. This addresses bug HIVE-4435. https://issues.apache.org/jira/browse/HIVE-4435 Diffs ----- ql/src/java/org/apache/hadoop/hive/ql/udf/generic/NumDistinctValueEstimator.java 69e6f46 Diff: https://reviews.apache.org/r/10841/diff/ Testing ------- The estimates are within the expected error after this fix. Tested on TPCH of varying sizes. Thanks, Shreepadma Venugopalan