ColumnSpec (druid-server 29.0.1 API)

java.lang.Object
- org.apache.druid.catalog.model.ColumnSpec

```
public class ColumnSpec
extends Object
```
Specification of table columns.

Constructor Summary

Constructors
Constructor Description

ColumnSpec(String name, String dataType, Map<String,Object> properties)

ColumnSpec(ColumnSpec from)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`dataType()`
`boolean`	`equals(Object o)`
`int`	`hashCode()`
`ColumnSpec`	`merge(Map<String,ModelProperties.PropertyDefn<?>> columnProperties, ColumnSpec update)`	Merges an updated version of this column with an existing version.
`String`	`name()`
`Map<String,Object>`	`properties()`
`String`	`toString()`
`void`	`validate()`

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

- Constructor Detail
  - ColumnSpec
```
public ColumnSpec(String name,
                  @Nullable
                  String dataType,
                  @Nullable
                  Map<String,Object> properties)
```
  - ColumnSpec
```
public ColumnSpec(ColumnSpec from)
```
- Method Detail
  - name
```
public String name()
```
  - dataType
```
public String dataType()
```
  - properties
```
public Map<String,Object> properties()
```
  - validate
```
public void validate()
```
  - merge
```
public ColumnSpec merge(Map<String,ModelProperties.PropertyDefn<?>> columnProperties,
                        ColumnSpec update)
```
    Merges an updated version of this column with an existing version.
    The name cannot be changed (it is what links the existing column and the update). The SQL type will be that provided in the update, if non-null, else the original type. Properties are merged using standard rules: those in the update take precedence. Null values in the update remove the existing property, non-null values update the property. Any properties in the update but not in the existing set, are inserted (if non-null).
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object