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Currently, with FLIP-123, FLIP-152, we have supported  Hive dialect.  But it's much dependent on Flink planner. Also the interfaces involved is more like to be internal, which is not convenient and available to implement other dialects.

So, this Flip FLIP is to Introduce pluggable dialect with some public interfaces to that make convenient to support other dialects.  Also, at the same time, it's intend to slove the legacy problem brought by supporting Hive dialect that the Hive connector is coupled to Flink planner, which brings much complexity andmaintenance burden.

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