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https://issues.apache.org/jira/browse/FLINK-11184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16723603#comment-16723603
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Wenlong Lyu commented on FLINK-11184:
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Hi, Timo, I think there is one more issue may needed to be considered：add an
explicit way to defining the conversion from a user defined type <T> to
structed type in table, which make the conversion from a DataStream to a
Dynamic Table more clear.
> Rework TableSource and TableSink interfaces
> -------------------------------------------
>
> Key: FLINK-11184
> URL: https://issues.apache.org/jira/browse/FLINK-11184
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
>
> There are a couple of shortcomings with the current {{TableSource}} and
> {{TableSink}} interface design. Some of the issues are covered in a [basic
> design
> document|https://docs.google.com/document/d/1Yaxp1UJUFW-peGLt8EIidwKIZEWrrA-pznWLuvaH39Y/edit#heading=h.41fd6rs7b3cf]
> that was published a while ago.
> The design document has not been updated for some time and partially overlaps
> with the [current SQL DDL
> discussion|http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-Flink-SQL-DDL-Design-td25006.html]
> for the {{CREATE TABLE}} statement on the ML.
> What needs to be solved:
> - How to unify sources and sinks in regards of schema and time attributes?
> - How to define watermarks, timestamp extractors or timestamp ingestion?
> - How to define primary keys and partitioning keys?
> - How to differentiate between update modes for tables (i.e. how to read from
> a append, retraction, or update table)?
> - How to express all of the above without pulling in to many dependencies on
> other Flink modules if source and sink interfaces are located in
> {{flink-table-spi}} package?
> As of the current state of the discussion, it seems that we might extend
> {{TableSchema}} to allow for returning the information above and remove
> current interfaces such as {{DefinedRowtimeAttribute}} or
> {{DefinedFieldMapping}}.
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