ClassDataTypeConverter (Flink : Table : Common 2.1.0 API)

java.lang.Object
- org.apache.flink.table.types.utils.ClassDataTypeConverter

```
@Internal
public final class ClassDataTypeConverter
extends Object
```
Class-based data type extractor that supports extraction of clearly identifiable data types for input and output conversion.
Note: In most of the cases, DataTypeExtractor is more useful as it also considers structured types and type variables possibly annotated with DataTypeHint.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static Optional<DataType>`	`extractDataType(Class<?> clazz)`	Returns the clearly identifiable data type if possible.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - extractDataType
```
public static Optional<DataType> extractDataType(Class<?> clazz)
```
    Returns the clearly identifiable data type if possible. For example, Long can be expressed as DataTypes.BIGINT(). However, for example, Row cannot be extracted as information about the fields is missing. Or BigDecimal needs to be mapped from a variable precision/scale to constant ones.