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Posted to dev@hive.apache.org by "Prasanth J (JIRA)" <ji...@apache.org> on 2014/03/20 19:40:47 UTC

[jira] [Created] (HIVE-6711) ORC maps uses getMapSize() from MapOI which is unreliable

Prasanth J created HIVE-6711:
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             Summary: ORC maps uses getMapSize() from MapOI which is unreliable
                 Key: HIVE-6711
                 URL: https://issues.apache.org/jira/browse/HIVE-6711
             Project: Hive
          Issue Type: Bug
    Affects Versions: 0.12.0, 0.11.0, 0.13.0
            Reporter: Prasanth J
            Assignee: Prasanth J
             Fix For: 0.13.0, 0.14.0


HIVE-6707 had issues with map size. getMapSize() of LazyMap and LazyBinaryMap does not deserialize the keys and count the number of unique keys. Since getMapSize() may return non-distinct count of keys, the length of maps stored using ORC's map tree writer will not be in sync with actual map size. As a result of this RLE reader will try to read beyond the disk range expecting more map entries and will throw exception.



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