All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addReferenceCount()`
`protected abstract void`	`checkType()`
`void`	`close()`
`protected abstract void`	`evaluate()`	Responsible for the calculation
`org.apache.iotdb.tsfile.read.common.block.column.Column`	`getColumn()`
`int`	`getColumnCachePositionCount()`
`org.apache.iotdb.tsfile.read.common.type.Type`	`getType()`
`void`	`initializeColumnCache(org.apache.iotdb.tsfile.read.common.block.column.Column column)`
`boolean`	`isReturnTypeNumeric()`
`void`	`tryEvaluate()`

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

protected final org.apache.iotdb.tsfile.read.common.type.Type returnType

protected final ColumnCache columnCache

public ColumnTransformer(org.apache.iotdb.tsfile.read.common.type.Type returnType)

public org.apache.iotdb.tsfile.read.common.block.column.Column getColumn()

public void initializeColumnCache(org.apache.iotdb.tsfile.read.common.block.column.Column column)

public int getColumnCachePositionCount()

public org.apache.iotdb.tsfile.read.common.type.Type getType()

evaluate
```
protected abstract void evaluate()
```
Responsible for the calculation

Modifier and Type	Field	Description
`protected ColumnCache`	`columnCache`
`protected int`	`referenceCount`
`protected org.apache.iotdb.tsfile.read.common.type.Type`	`returnType`

Class ColumnTransformer