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https://issues.apache.org/jira/browse/FLINK-22071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17327233#comment-17327233
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Wong Mulan commented on FLINK-22071:
------------------------------------

Could we add ParallelTableFunctionProvider interface.
{code:java}
interface ParallelTableFunctionProvider extends TableFunctionProvider, 
ParallelismProvider
{code}

and set this parallelism in CommonLookupJoin class.
For example:
{code:java}
val finalParallelism = if (parallelism > 0) { 
  parallelism 
} else { 
  inputTransformation.getParallelism 
} 
ExecNode.createOneInputTransformation( 
  inputTransformation, 
  getRelDetailedDescription, 
  operatorFactory, 
  InternalTypeInfo.of(resultRowType), 
  finalParallelism)
{code}

> LookupTableSource.LookupRuntimeProvider customizes parallelism
> --------------------------------------------------------------
>
>                 Key: FLINK-22071
>                 URL: https://issues.apache.org/jira/browse/FLINK-22071
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Planner
>    Affects Versions: 1.13.0
>            Reporter: Wong Mulan
>            Priority: Major
>
> Now, sink table can customize parallelism. LookupTable is not supported. 
> Could we add this capability.



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