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xingyuan cheng edited comment on FLINK-27815 at 2/23/23 2:12 AM: ----------------------------------------------------------------- Hello [~godfreyhe] , I have two questions about question 1 1. Do we need to implement the heuristicJoinOrder similar to Calcite to solve the order problem of multi-table joins 2. The JoinAssociationRule and JoinPushThroughJoinRule of Calcite will match the left deep tree and take effect on the inner join. Do we also need support? was (Author: complone): Hello [~godfreyhe] , I have two questions about question 1 1. Do we need to implement the heuristicJoinOrder similar to Calcite to solve the order problem of multi-table joins 2. The JoinAssociationRule of Calcite will match the left deep tree and take effect on the inner join. Do we also need support? > Improve the join reorder strategy for batch sql job > ---------------------------------------------------- > > Key: FLINK-27815 > URL: https://issues.apache.org/jira/browse/FLINK-27815 > Project: Flink > Issue Type: New Feature > Components: Table SQL / Planner > Reporter: godfrey he > Assignee: godfrey he > Priority: Major > Labels: pull-request-available > > Join is heavy operation in the execution, the join order in a query can have > a significant impact on the query’s performance. > Currently, the planner has one join reorder strategy which is provided by > Apache Calcite, and it strongly depends on the statistics. > It's better we can provide different join reorder strategies for different > situations, such as: > 1. provide a join reorder strategy without statistics, e.g. eliminate cross > joins > 2. improve current join reorders strategy with statistics > 3. provide hints to allow users to choose join order strategy > 4. ... -- This message was sent by Atlassian Jira (v8.20.10#820010)