Zoltan Haindrich created HIVE-20491:
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Summary: Fix mapjoin size estimations for Fast implementation
Key: HIVE-20491
URL: https://issues.apache.org/jira/browse/HIVE-20491
Project: Hive
Issue Type: Improvement
Components: Statistics
Reporter: Zoltan Haindrich
Assignee: Zoltan Haindrich
HIVE-19824 have fixed the estimations; but it calculated for the "optimized"
impl; the "fast" one has a little bit bigger footprint.
It also seems like fast is a bit overestimated at runtime...that should be also
taken care of.
| numkeys | implementation | compiler estimation | runtime estimation | runtime
measurement | ce / rm | re / rm |
| 25M | FAST | 1168435456 | 2189433712 | 1513584984 | .77 | 1.44 |
| 25M | OPTIMIZED | 1168435456 | 1191203764 | 1168439664 | 100% | 1.01 |
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