Jesus Camacho Rodriguez created HIVE-13069:
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Summary: Enable cartesian product merging
Key: HIVE-13069
URL: https://issues.apache.org/jira/browse/HIVE-13069
Project: Hive
Issue Type: Bug
Components: Parser
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Currently we can merge 2-way joins into n-way joins when the joins are executed
over the same column.
In turn, CBO might produce plans containing cartesian products if the join
columns are constant values; after HIVE-12543 went in, this is rather common,
as those constant columns are correctly pruned. However, currently we do not
merge a cartesian product with two inputs into a cartesian product with
multiple inputs, which could result in performance loss.
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