ccoffline opened a new issue #5212: URL: https://github.com/apache/incubator-doris/issues/5212
**Is your feature request related to a problem? Please describe.** One of the join strategies for now is to predict whether the broadcast join will exceed the memory limit. https://github.com/apache/incubator-doris/blob/65d33cf43c837e56a2a36e78b358bfc0a9d1916b/fe/fe-core/src/main/java/org/apache/doris/planner/DistributedPlanner.java#L356-L378 The variable `HASH_TBL_SPACE_OVERHEAD = 1.1` is inappropriate, which causes many large JOIN queries to use broadcast join. https://github.com/apache/incubator-doris/blob/65d33cf43c837e56a2a36e78b358bfc0a9d1916b/fe/fe-core/src/main/java/org/apache/doris/planner/PlannerContext.java#L37-L39 **Describe the solution you'd like** Add a new variable `broadcast_mem_limit` and set `1G` as defaults. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
