[ https://issues.apache.org/jira/browse/FLINK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355911#comment-15355911 ]
ASF GitHub Bot commented on FLINK-3942: --------------------------------------- Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/2159#discussion_r69039259 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala --- @@ -471,6 +471,32 @@ class Table( } /** + * Intersect two [[Table]]s. Intersect All returns records that exist in both tables, but not --- End diff -- I would rephrase this to "Intersect All returns records that exist in both tables. If a record is present in both tables more than once, it is returned as many times as it is present in both tables, i.e., the resulting table might have duplicate records." > 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)