commit | 7b0af74483521615f302d2a3376556dad325297f | [log] [tgz] |
---|---|---|
author | Jihoon Son <jihoonson@apache.org> | Fri Mar 04 16:12:16 2016 +0900 |
committer | Jihoon Son <jihoonson@apache.org> | Fri Mar 04 16:12:16 2016 +0900 |
tree | f26defc4c49086ea5e4eaca368dd8469b5aa915c | |
parent | fdb76ed2c7c06e7a9b43bbea18e202586b88606a [diff] |
TAJO-2082: Aggregation on a derived table which includes union can cause incorrect result. Closes #969
Tajo is a relational and distributed data warehouse system for Hadoop. Tajo is designed for low-latency and scalable ad-hoc queries, online aggregation and ETL on large-data sets by leveraging advanced database techniques. It supports SQL standards. It has its own query engine which allows direct control of distributed execution and data flow. As a result, Tajo has a variety of query evaluation strategies and more optimization opportunities. In addition, Tajo will have a native columnar execution and and its optimizer.
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