Column pruning after join+group-by query
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Key: HIVE-284
URL: https://issues.apache.org/jira/browse/HIVE-284
Project: Hadoop Hive
Issue Type: Improvement
Affects Versions: 0.2.0, 0.3.0
Reporter: Zheng Shao
The query is:
explain INSERT OVERWRITE TABLE t
SELECT t1.r, t2.c, sum(t1.v * t2.v)
FROM t1 join t2 on t1.c = t2.r
GROUP BY t1.r, t2.c;
The FileSinkOperator after the join is serializing all 6 columns from the 2
tables (both have 3 columns: r, c, v) instead of the 4 that is needed later.
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