Xuefu Zhang created HIVE-7384: --------------------------------- Summary: Research into reduce-side join Key: HIVE-7384 URL: https://issues.apache.org/jira/browse/HIVE-7384 Project: Hive Issue Type: Sub-task Components: Spark Reporter: Xuefu Zhang
Hive's join operator is very sophisticated, especially for reduce-side join. While we expect that other types of join, such as map-side join and SMB map-side join, will work out of the box with our design, there may be some complication in reduce-side join, which extensively utilizes key tag and shuffle behavior. Our design principle prefer to make Hive implementation work out of box also, which might requires new functionality from Spark. The tasks is to research into this area, identifying requirements for Spark community and work to be done on Hive to make reduce-side join work. A design doc might be needed for this. For more information, please refer to the overall design doc on wiki. -- This message was sent by Atlassian JIRA (v6.2#6252)