[jira] [Created] (FLINK-20862) Add a converter from TypeInformation to DataType

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-20862:
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             Summary: Add a converter from TypeInformation to DataType
                 Key: FLINK-20862
                 URL: https://issues.apache.org/jira/browse/FLINK-20862
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Timo Walther
            Assignee: Timo Walther


Implement a new TypeInfoDataTypeConverter that will no longer produce LegacyTypeInformationType.

As mentioned in the FLIP:
- All types from DataStream API should be supported by this converter.
- TupleTypeInfoBase will be translated into a proper RowType or StructuredType.
- BigDecimals will be converted to DECIMAL(38,18) by default.
- Composite types (tuples, POJOs, rows) will be flattened by default if they are used as top-level records (similar to the old behavior).
- The order of POJO field's is determined by the DataTypeExtractor and must not be defined manually anymore.
- GenericTypeInfo is converted to RawType immediately by considering the current configuration.
- A DataStream that originated from Table API will keep its DataType information due to ExternalTypeInfo implementing DataTypeQueryable.



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