Gopal V created HIVE-12492:
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Summary: MapJoin: 4 million unique integers seems to be a probe
plateau
Key: HIVE-12492
URL: https://issues.apache.org/jira/browse/HIVE-12492
Project: Hive
Issue Type: Bug
Reporter: Gopal V
Assignee: Gopal V
Fix For: 2.0.0
After 4 million keys, the map-join implementation seems to suffer from a
performance degradation.
The hashtable build & probe time makes this very inefficient, even if the data
is very compact (i.e 2 ints).
Falling back onto the shuffle join or bucket map-join is useful after 2^22
items.
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