ExpressionTransform (druid-processing 28.0.1 API)

java.lang.Object
- org.apache.druid.segment.transform.ExpressionTransform

All Implemented Interfaces:: Transform

public class ExpressionTransform
extends Object
implements Transform

Constructor Summary

Constructors
Constructor Description

ExpressionTransform(String name, String expression, ExprMacroTable macroTable)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object o)`
`String`	`getExpression()`
`String`	`getName()`	Returns the field name for this transform.
`Set<String>`	`getRequiredColumns()`	Returns the names of all columns that this transform is going to read.
`RowFunction`	`getRowFunction()`	Returns the function for this transform.
`int`	`hashCode()`
`String`	`toString()`

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

- Constructor Detail
  - ExpressionTransform
```
public ExpressionTransform(String name,
                           String expression,
                           ExprMacroTable macroTable)
```
- Method Detail
  - getName
```
public String getName()
```
    Description copied from interface: Transform
    
    Returns the field name for this transform.
    
    Specified by:
    
    getName in interface Transform
  - getExpression
```
public String getExpression()
```
  - getRowFunction
```
public RowFunction getRowFunction()
```
    Description copied from interface: Transform
    
    Returns the function for this transform. The RowFunction takes an entire row as input and returns a column value as output.
    
    Specified by:
    
    getRowFunction in interface Transform
  - getRequiredColumns
```
public Set<String> getRequiredColumns()
```
    Description copied from interface: Transform
    
    Returns the names of all columns that this transform is going to read.
    
    Specified by:
    
    getRequiredColumns in interface Transform
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object