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https://issues.apache.org/jira/browse/FLINK-12088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu updated FLINK-12088:
----------------------------
    Description: 
This operator is responsible for unbounded streaming inner/left/right/full 
join, and will be optimized in following cases:
# If the join keys (with equality condition) are also primary key, we will have 
a more efficient state layout
# If the inputs have primary keys, but join keys are not primary key, we can 
also come up with an efficient state layout
# Inputs don't have primary keys, this will go to default implementation


  was:
This operator is responsible for unbounded streaming inner join, and will be 
optimized in following cases:
# If the join keys (with equality condition) are also primary key, we will have 
a more efficient state layout
# If the inputs have primary keys, but join keys are not primary key, we can 
also come up with an efficient state layout
# Inputs don't have primary keys, this will go to default implementation



> Introduce unbounded streaming inner/left/right/full join operator
> -----------------------------------------------------------------
>
>                 Key: FLINK-12088
>                 URL: https://issues.apache.org/jira/browse/FLINK-12088
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Runtime
>            Reporter: Kurt Young
>            Assignee: Jark Wu
>            Priority: Major
>
> This operator is responsible for unbounded streaming inner/left/right/full 
> join, and will be optimized in following cases:
> # If the join keys (with equality condition) are also primary key, we will 
> have a more efficient state layout
> # If the inputs have primary keys, but join keys are not primary key, we can 
> also come up with an efficient state layout
> # Inputs don't have primary keys, this will go to default implementation



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