Navis created HIVE-4068:
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Summary: Size of aggregation buffer which uses non-primitive type
is not estimated correctly
Key: HIVE-4068
URL: https://issues.apache.org/jira/browse/HIVE-4068
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Navis
Assignee: Navis
Priority: Minor
Currently, hive assumes an aggregation buffer which holds a map is occupying
just 256 byte (fixed). If it's bigger than that in real, OutOfMemoryError can
be thrown (especially for >1k buffer).
workaround : set hive.map.aggr.hash.percentmemory=<smaller value than
default(0.5)>
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