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https://issues.apache.org/jira/browse/PHOENIX-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Viraj Jasani updated PHOENIX-7648:
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    Fix Version/s: 5.3.0

> Introduce new Atomic Operation - ON DUPLICATE KEY UPDATE_ONLY
> -------------------------------------------------------------
>
>                 Key: PHOENIX-7648
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-7648
>             Project: Phoenix
>          Issue Type: New Feature
>            Reporter: Viraj Jasani
>            Priority: Major
>             Fix For: 5.3.0
>
>
> Phoenix provides two types of Atomic Update operations: ON DUPLICATE KEY 
> IGNORE and ON DUPLICATE KEY UPDATE.
> The purpose of ON DUPLICATE KEY IGNORE is to perform the insertion of new row 
> i.e. if the row does not exist, add the row, else ignore the update 
> operation. The purpose of ON DUPLICATE KEY UPDATE is to provide atomic update 
> based on the expressions provided on the various non-pk columns. For the 
> conditional updates that include CASE expression, the atomic update goes 
> through successfully only if the condition is satisfied on the row.
> However, if the row does not already exist, ON DUPLICATE KEY UPDATE performs 
> the insertion anyways regardless of the condition provided. There are valid 
> use cases that consider the absence of the row as condition not being 
> satisfied i.e. if the row does not exist, the condition provided with CASE 
> statement is not satisfied anyways.
> Therefore, the purpose of this Jira is to introduce new type of atomic update 
> operation with statement ON DUPLICATE KEY UPDATE_ONLY, that performs the 
> condition evaluation similar to ON DUPLICATE KEY UPDATE, however if the row 
> does not exist, UPDATE_ONLY is not expected to perform any insertion.



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