Fabian Hueske created FLINK-3943:
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Summary: Add support for EXCEPT (set minus)
Key: FLINK-3943
URL: https://issues.apache.org/jira/browse/FLINK-3943
Project: Flink
Issue Type: New Feature
Components: Table API
Affects Versions: 1.1.0
Reporter: Fabian Hueske
Priority: Minor
Currently, the Table API and SQL do not support EXCEPT.
EXCEPT can be executed as a coGroup on all fields that forwards records of the
first input if the second input is empty.
In order to add support for EXCEPT to the Table API and SQL we need to:
- Implement a {{DataSetMinus}} class that translates an EXCEPT into a DataSet
API program using a coGroup on all fields.
- Implement a {{DataSetMinusRule}} that translates a Calcite {{LogicalMinus}}
into a {{DataSetMinus}}.
- Extend the Table API (and validation phase) to provide an except() method.
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