Maryann Xue created PHOENIX-68:
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Summary: Add Option "FAVOR_STAR_JOIN" to indicate if star join
optimization is preferred for multi inner join queries
Key: PHOENIX-68
URL: https://issues.apache.org/jira/browse/PHOENIX-68
Project: Phoenix
Issue Type: Improvement
Affects Versions: 3.0.0
Reporter: Maryann Xue
Assignee: Maryann Xue
Priority: Minor
Fix For: 3.0.0
We enable an option called "FAVOR_STAR_JOIN" to allow for choosing different
execution plans for multi inner join queries.
For example:
select * from A inner join B on A.ab_id = B.ab_id inner join C on A.ac_id =
C.ac_id and B.bc_id = C.bc_id;
When using star-join optimization, the execution steps will be like:
hash B, hash C --> join A
If star-join is turned off, the execution steps will be like:
hash A --> join B --> hash temp result AB --> join C
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