mahesh kumar behera created HIVE-25042:
------------------------------------------
Summary: Add support for map data type in Common merge join and
SMB Join
Key: HIVE-25042
URL: https://issues.apache.org/jira/browse/HIVE-25042
Project: Hive
Issue Type: Sub-task
Components: Hive, HiveServer2
Reporter: mahesh kumar behera
Merge join results depends on the underlying sorter used by the mapper task as
we need to judge the direction after each key comparison. So the comparison
done during join has to match the way the records are sorted by the mapper. As
per the sorter used by mapper task (PipelinedSorter), hash-maps with same
key-value pair in different order are not equal. So the merge join also behaves
the same way. But map join treats them as equal. We have to modify the
pipelined sorter code to handle the map datatype. Then support has to be added
in the Join code to support map types.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
