Hyunsik Choi created TAJO-2007:
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Summary: By default, Optimizer should use the table volume in
TableStat.
Key: TAJO-2007
URL: https://issues.apache.org/jira/browse/TAJO-2007
Project: Tajo
Issue Type: Improvement
Components: Planner/Optimizer
Reporter: Hyunsik Choi
Assignee: Hyunsik Choi
Fix For: 0.12.0, 0.11.1
Currently, the optimizer by default gets table volumes through storage manager
and employ them for join optimization. But, in some cases, it causes
performance degradation because aggregating all file volumes is not cheap in
large partitioned tables on S3 or HDFS.
So, this patch improves TableStatUpdateRewriter to use table volumes of
TableStat by default, and it also adds a session variable 'USE_TABLE_VOLUME' to
allow the optimizer to use the table volume through storage handler.
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