map-side aggregations does not work properly
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Key: HIVE-170
URL: https://issues.apache.org/jira/browse/HIVE-170
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Reporter: Namit Jain
Assignee: Namit Jain
map-side aggregation depends on runtime.freememory() which is not guaranteed to
return the freeable memory - it depends on when the garbage collector is
invoked last.
It might be a good idea to estimate the number of rows that can fit in the hash
table and then flush the hash table based on that
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