Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/3039
Hi @mushketyk , thanks for the updating.
Regarding to the `TableSource` , currently, there are 8 `TableSource`
interfaces provided to users including trait and abstract class. It is a little
hard to choose which one to use to implement a custom table source. What about
to implement `TableSource` as abstract class and provide default implementation
for `getFieldNames()` and `getFieldsIndices()`. And provide three other
abstract class : `BatchTableSource` (with `getDataSet` interface) ,
`StreamTableSource` (with `getDataStream` interface) and
`BatchStreamTableSource` (with both interfaces), they all extend `TableSource`.
In this way, we only provide 4 classes to user, the implementers should extend
one of the latter three abstract class. What do you think ?
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