Fabian Hueske created FLINK-3944:
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Summary: Add optimization rules to reorder Cartesian products and
joins
Key: FLINK-3944
URL: https://issues.apache.org/jira/browse/FLINK-3944
Project: Flink
Issue Type: Bug
Components: Table API
Affects Versions: 1.1.0
Reporter: Fabian Hueske
Priority: Critical
Fix For: 1.1.0
Currently, we do not support the execution of Cartesian products.
Because we do not optimize the order of joins (due to missing statistics),
joins are executed in the order in which they are specified. This works well
for the Table API, however it can be problematic in case of SQL queries where
the order of tables in the FROM clause should not matter.
In case of SQL queries, it can happen that the optimized plan contains
Cartesian products because joins are not reordered. If we add optimization
rules that switch Cartesian products and joins, such situations can be resolved.
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