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https://issues.apache.org/jira/browse/FLINK-17399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17093070#comment-17093070
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godfrey he commented on FLINK-17399:
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It's not a new feature specially for old planner, such as
https://github.com/apache/flink/pull/11862 can use this feature to add some
tests. and the change is very small.
> CsvTableSink should also extend from OverwritableTableSink
> ----------------------------------------------------------
>
> Key: FLINK-17399
> URL: https://issues.apache.org/jira/browse/FLINK-17399
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: godfrey he
> Priority: Major
> Fix For: 1.11.0
>
>
> {{CsvTableSink}} has supported {{writeMode}} which could be {{OVERWRITE}} or
> {{NO_OVERWRITE}}. When we execute "INSERT OVERWRITE csv_table_sink xx",
> planners will check whether a table sink is an {{OverwritableTableSink}}.
> Now {{CsvTableSink}} does not extend from {{OverwritableTableSink}}, so we
> can't execute above statement.
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