MapJoin to Check Number of Files to Match Metadata
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Key: HIVE-1249
URL: https://issues.apache.org/jira/browse/HIVE-1249
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Siying Dong
Assignee: Namit Jain
Priority: Minor
Sorted Map Join only can execute when two tables' bucket numbers are the same.
Currently, the checking is done by looking at metadata of the table. However,
for some reason, the real physical storage is not guaranteed to follow what the
metadata indicates. In that case, Sorted Map Join might fail to identify it and
deliver wrong results. An extra check when storage scan is necessary to deal
with the scenario.
This issue may also apply to normal map join.
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