alamb opened a new issue #143: URL: https://github.com/apache/arrow-datafusion/issues/143
*Note*: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-11116 Currently, the left join implementation keeps a HashSet<Vec<u8>> to mark each key as visited. However, a more efficient choice would be to keep a bitmap or a boolean marker for each key or index and mark the row as visited, avoiding unnecessary hashing, copying / memory usage. This bitmap / marker can be visited at the end of the join, efficiently adding the remaining left rows with no match. -- 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]
