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ASF GitHub Bot updated FLINK-12371: ----------------------------------- Labels: pull-request-available (was: ) > Add support for converting (NOT) IN/ (NOT) EXISTS to SemiJoin, and generating > optimized logical plan > ---------------------------------------------------------------------------------------------------- > > Key: FLINK-12371 > URL: https://issues.apache.org/jira/browse/FLINK-12371 > Project: Flink > Issue Type: New Feature > Components: Table SQL / Planner > Reporter: godfrey he > Assignee: godfrey he > Priority: Major > Labels: pull-request-available > > This issue aims to convert IN/EXISTS to semi-join, and NOT IN/NOT EXISTS to > anti-join. > In Calcite, > [SemiJoin|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/core/SemiJoin.java] > only represents semi-join, (could not represent anti-join) and requires equi > join condition. Queries like `select * from left where left.a1 in (select > right.a2 from right where left.b1 > right.b2)` and `select * from left where > not exists (select * from right)` could not be converted to Calcite SemiJoin > operator. > To solve the above problem, We need copy the {{SemiJoin}} class to Flink, and > make the following changes: > 1. make {{SemiJoin}} extending from {{Join}}, not from {{EquiJoin}}. (to > support non-equi join condition) > 2. add {{isAnti}} field attribute to represent anti-join. > Currently, there are no rules to convert (NOT) IN/ (NOT) EXISTS to SemiJoin, > so we need a whole new rule (named {{FlinkSubQueryRemoveRule}}) to meet our > requirement. -- This message was sent by Atlassian JIRA (v7.6.3#76005)