Szehon Ho created HIVE-8639:
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Summary: Convert SMBJoin to MapJoin [Spark Branch]
Key: HIVE-8639
URL: https://issues.apache.org/jira/browse/HIVE-8639
Project: Hive
Issue Type: Sub-task
Reporter: Szehon Ho
HIVE-8202 supports auto-conversion of SMB Join. However, if the tables are
partitioned, there could be a slow down as each mapper would need to get a very
small chunk of a partition which has a single key. Thus, in some scenarios it's
beneficial to convert SMB join to map join.
The task is to research and support the conversion from SMB join to map join
for Spark execution engine. See the equivalent of MapReduce in
SortMergeJoinResolver.
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