[jira] [Created] (HIVE-22239) Scale data size using column value ranges

["Jesus Camacho Rodriguez (Jira)" <ji...@apache.org>]

Jesus Camacho Rodriguez created HIVE-22239:
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             Summary: Scale data size using column value ranges
                 Key: HIVE-22239
                 URL: https://issues.apache.org/jira/browse/HIVE-22239
             Project: Hive
          Issue Type: Improvement
          Components: Physical Optimizer
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


Currently, min/max values for columns are only used to determine whether a certain range filter falls out of range and thus filters all rows or none at all. If it does not, we just use a heuristic that the condition will filter 1/3 of the input rows. Instead of using that heuristic, we can use another one that assumes that data will be uniformly distributed across that range, and calculate the selectivity for the condition accordingly.

This patch also includes the propagation of min/max column values from statistics to the optimizer for timestamp type.



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