[jira] [Created] (FLINK-15161) Introduce TypeTransformation interface and basic transformations

[Shang Yuanchun (Jira)]

Jark Wu created FLINK-15161:
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             Summary: Introduce TypeTransformation interface and basic transformations
                 Key: FLINK-15161
                 URL: https://issues.apache.org/jira/browse/FLINK-15161
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
            Reporter: Jark Wu
            Assignee: Jark Wu


Currently, the default DataType derived from properties is the default conversion now. However, some connectors/formats are still using sql Timestamp. But bridging DataType into sql Timestamp  is not simple, because DataType is nested. So we propose to introduce a TypeTransformation which transform one data type to another, this is also a useful tool for FLIP-65.

The proposal including:
- Remove {{CallContext}} from the exiting {{TypeTransformation}}.
- add a package {{o.a.f.table.types.inference.transforms}}
- add commonly used transform classes there, e.g. {{timeToSqlTypes}}
- add a class `o.a.f.table.types.inference.TypeTransforms` for listing all available transforms



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