godfreyhe commented on issue #9438: [WIP] [FLINK-13712] [docs] Add release notes for Flink 1.9.0 URL: https://github.com/apache/flink/pull/9438#issuecomment-521602216 other limitations: 1. The Blink planner only support the brand new `Catalog` and does not support `ExternalCatalog` which is deprecated. 2. Blink planner does not support `BatchTableSource`. 3. The implementations of `FilterableTableSource` for the Flink planner and the Blink planner are incompatible. The Flink planner will push down `PlannerExpression`s into `FilterableTableSource`, while the Blink planner will push down `Expression`s.
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