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https://issues.apache.org/jira/browse/PHOENIX-68?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maryann Xue updated PHOENIX-68:
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Description:
We enable a SQL hint called "NO_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
was:
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
> Add hint "NO_STAR_JOIN" to indicate if star join optimization should be
> avoided 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
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> We enable a SQL hint called "NO_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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