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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/01/06 02:22:41 UTC

[GitHub] [flink] godfreyhe commented on issue #10769: [FLINK-15479]Override explainSource method for JDBCTableSource

godfreyhe commented on issue #10769: [FLINK-15479]Override explainSource method for JDBCTableSource
URL: https://github.com/apache/flink/pull/10769#issuecomment-570979120
 
 
   I think we should fix the default implementation of `explainSource` in `TableSource` which returns the field names from `getProducedDataType` instead of `getTableSchema`. Table schema is a logical description of a table and should not be part of the physical TableSource, while the value of `explainSource` should be changed with optimization (e.g. projection push down)

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