Efficient join with one or more large dimension tables
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United States of America Patent
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Sep 22, 2015
Grant Date -
Jul 31, 2014
app pub date -
Jan 31, 2013
filing date -
Jan 31, 2013
priority date (Note) -
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Abstract
Embodiments of the invention relate to processing queries that utilize fact and/or dimension tables. In one aspect, a pre-join filtering phase precedes a star join. The necessary conditions for the pre-join filtering are considered for a given SQL query, including an estimated size of the hash table exceeding a threshold and presence of a local predicate either on the fact table or one or more dimension tables that is not a large dimension table. Once the necessary conditions are satisfied, the execution of the query exploits the pre-join filtering to build a pre-join output filter from columns of a reduced fact table that joins with each large dimension table. Thereafter, all the dimension tables and the fact table are joined in a star join while exploiting each pre-join filter.
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