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ASF GitHub Bot commented on FLINK-3942: --------------------------------------- Github user fhueske commented on the issue: https://github.com/apache/flink/pull/2159 Hi @wuchong, thanks for the update! The PR looks mostly good. I left a few minor comments. Thanks, Fabian > Add support for INTERSECT > ------------------------- > > Key: FLINK-3942 > URL: https://issues.apache.org/jira/browse/FLINK-3942 > Project: Flink > Issue Type: New Feature > Components: Table API & SQL > Affects Versions: 1.1.0 > Reporter: Fabian Hueske > Assignee: Jark Wu > Priority: Minor > > Currently, the Table API and SQL do not support INTERSECT. > INTERSECT can be executed as join on all fields. > In order to add support for INTERSECT to the Table API and SQL we need to: > - Implement a {{DataSetIntersect}} class that translates an INTERSECT into a > DataSet API program using a join on all fields. > - Implement a {{DataSetIntersectRule}} that translates a Calcite > {{LogicalIntersect}} into a {{DataSetIntersect}}. > - Extend the Table API (and validation phase) to provide an intersect() > method. -- This message was sent by Atlassian JIRA (v6.3.4#6332)