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https://issues.apache.org/jira/browse/FLINK-20620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17250159#comment-17250159
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godfrey he commented on FLINK-20620:
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cc [~dianfu]
> Port BatchExecPythonCalc and StreamExecPythonCalc to Java
> ---------------------------------------------------------
>
> Key: FLINK-20620
> URL: https://issues.apache.org/jira/browse/FLINK-20620
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Reporter: godfrey he
> Priority: Major
>
> https://issues.apache.org/jira/browse/FLINK-20610 will separate the
> implementation of BatchExecCalc and StreamExecCalc, and port BatchExecCalc
> and StreamExecCalc to Java.
> {{StreamExecPythonCalc}} extends from {{CommonExecPythonCalc}} and
> {{CommonExecPythonCalc}} extends from {{CommonPythonBase}}, they are all
> Scala classes, and involves a lot of code. Java class can't extend Scala
> interface with default implementation. So I create an issue separately to
> port them to Java.
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