TypeDescriptor (druid-processing 30.0.1 API)

All Known Implementing Classes:

ExprType, ValueType
```
@Immutable
public interface TypeDescriptor
```
This is a bridge between ValueType and ExprType, so that they can both be used with TypeSignature. This interface assists in classifying the specific enum values that implement this interface into the current type families: 'primitives', 'arrays', and 'complex' types through isPrimitive() and isArray() At some point we should probably consider reworking this into a 'TypeFamily' enum that maps these high level families to specific types. This interface can potentially be removed if the expression processing system is updated to use ColumnType instead of ExpressionType, which would allow ExprType to be removed and this interface merged into ValueType (along with consolidation of several other interfaces, see TypeSignature javadoc for additional details).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isArray()`	Value is an array of some other `TypeDescriptor`
`boolean`	`isNumeric()`	Scalar numeric primitive values.
`boolean`	`isPrimitive()`	Scalar numeric and string values.

- Method Detail
  - isNumeric
```
boolean isNumeric()
```
    Scalar numeric primitive values.
    
    See Also:
    
    ValueType.isNumeric(), ExprType.isNumeric()
  - isPrimitive
```
boolean isPrimitive()
```
    Scalar numeric and string values. This does not currently include complex types.
    
    See Also:
    
    ValueType.isPrimitive(), ExprType.isPrimitive()
  - isArray
```
boolean isArray()
```
    Value is an array of some other TypeDescriptor
    
    See Also:
    
    ValueType.isArray(), ExprType.isArray()