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Posted to dev@hive.apache.org by "Dong Chen (JIRA)" <ji...@apache.org> on 2015/04/08 05:38:12 UTC

[jira] [Created] (HIVE-10257) Ensure Parquet Hive has null optimization

Dong Chen created HIVE-10257:
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             Summary: Ensure Parquet Hive has null optimization
                 Key: HIVE-10257
                 URL: https://issues.apache.org/jira/browse/HIVE-10257
             Project: Hive
          Issue Type: Sub-task
            Reporter: Dong Chen
            Assignee: Dong Chen


In Parquet statistics, a boolean value {{hasNonNullValue}} is used for each column chunk. Hive could use this value to skip a column, avoid null-checking logic, and speed up vectorization like HIVE-4478 (in the future, it is not completed yet).

In this Jira we could check whether this null optimization works, and make changes if any.



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