Github user KurtYoung commented on the issue:
https://github.com/apache/flink/pull/3520
To address the problem of not reusing `TableSource` when we create a new
scan for table source, i changed some inheritance for current `BatchScan`,
`StreamScan`, `BatchTableSourceScan`, `StreamTableSourceScan` and so on. The
new structure is moe likely as the relationship between `FlinkTable` and
`TableSourceTable`, `DataSetTable`, `DataStreamTable`.
After changing the structure, it also make it possible to unify the push
project into scan rule for both batch and stream mode.
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