[I] [Feature] Support to specify the aggregate fields for the partial-update merge engine [incubator-paimon]

["Aitozi (via GitHub)" <gi...@apache.org>]

Aitozi opened a new issue, #2242:
URL: https://github.com/apache/incubator-paimon/issues/2242

   ### Search before asking
   
   - [X] I searched in the [issues](https://github.com/apache/incubator-paimon/issues) and found nothing similar.
   
   
   ### Motivation
   
   Currently, the aggregation and partial-upadate are individual merge engine. And the partial-update will use `last_value_not_null`  
    aggregation semantic for the field not in sequence group, and `last_value` for the field in the sequence group.
   
   We can also support user set the aggregation function for the fields in partial-update merge engine. 
   This will benefit the case:  
   When merging multiple rows for the primary key into a wide table, user can set the aggregate strategy for the different field eg: sum/first_value/max ... 
   
   ### Solution
   
   Introduce fieldAggregators for the `PartialUpdateMergeFunction` and unify the current merge solution
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [X] I'm willing to submit a PR!


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Re: [I] [Feature] Support to specify the aggregate fields for the partial-update merge engine [incubator-paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi closed issue #2242: [Feature] Support to specify the aggregate fields for the partial-update merge engine
URL: https://github.com/apache/incubator-paimon/issues/2242


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