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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