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https://issues.apache.org/jira/browse/FLINK-11128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719959#comment-16719959
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Hequn Cheng commented on FLINK-11128:
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[~dfakhritdinov] Hi, could you share more about your problem? Theoretically,
you don't need to touch the private methods. You can take a look at the
{{OrcTableSource}} in Flink. It shows how to implement the
{{FilterableTableSource}} and how to handle these {{Expressions}} without
touching the private methods.
> Methods of org.apache.flink.table.expressions.Expression are private[flink]
> ---------------------------------------------------------------------------
>
> Key: FLINK-11128
> URL: https://issues.apache.org/jira/browse/FLINK-11128
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.7.0
> Reporter: Denys Fakhritdinov
> Assignee: vinoyang
> Priority: Critical
>
> Source with push-down are part of public API:
> [https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/sourceSinks.html#defining-a-tablesource-with-filter-push-down]
>
> {{But all methods of org.apache.flink.table.expressions.Expression are
> *{color:#FF0000}private[flink]{color}*, what makes it impossible to use.}}
>
> {{Please, change private[flink] to public.}}
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