Package org.apache.iotdb.db.mpp.transformation.dag.column.leaf

Class IdentityColumnTransformer

java.lang.Object

org.apache.iotdb.db.mpp.transformation.dag.column.ColumnTransformer

org.apache.iotdb.db.mpp.transformation.dag.column.leaf.LeafColumnTransformer

org.apache.iotdb.db.mpp.transformation.dag.column.leaf.IdentityColumnTransformer

public class IdentityColumnTransformer
extends LeafColumnTransformer

this is a special transformer which outputs data just as input without any modification.

i.e. it's just the function f(x) = x.

Field Summary

Fields inherited from class org.apache.iotdb.db.mpp.transformation.dag.column.ColumnTransformer

columnCache, referenceCount, returnType

Constructor Summary

Constructors

Constructor	Description
IdentityColumnTransformer(org.apache.iotdb.tsfile.read.common.type.Type returnType, int inputIndex)

Method Summary

Modifier and Type	Method	Description
void	initFromTsBlock(org.apache.iotdb.tsfile.read.common.block.TsBlock input)

Methods inherited from class org.apache.iotdb.db.mpp.transformation.dag.column.leaf.LeafColumnTransformer

checkType, evaluate

Methods inherited from class org.apache.iotdb.db.mpp.transformation.dag.column.ColumnTransformer

addReferenceCount, close, getColumn, getColumnCachePositionCount, getType, initializeColumnCache, isReturnTypeNumeric, tryEvaluate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IdentityColumnTransformer

public IdentityColumnTransformer(org.apache.iotdb.tsfile.read.common.type.Type returnType,
                                 int inputIndex)

Method Detail

initFromTsBlock

public void initFromTsBlock(org.apache.iotdb.tsfile.read.common.block.TsBlock input)

Specified by:

initFromTsBlock in class LeafColumnTransformer