unity.operators
Class Projection
java.lang.Object
unity.operators.Operator
unity.operators.Projection
public class Projection
- extends Operator
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Projection
public Projection(Operator in,
Expression[] exprList,
Relation outputRelation)
Projection
public Projection(Operator in,
ProjectionList plist)
init
public void init()
throws java.io.IOException
- Specified by:
init
in class Operator
- Throws:
java.io.IOException
next
public Tuple next()
throws java.io.IOException
- Specified by:
next
in class Operator
- Throws:
java.io.IOException
close
public void close()
throws java.io.IOException
- Overrides:
close
in class Operator
- Throws:
java.io.IOException
toString
public java.lang.String toString()
- Overrides:
toString
in class java.lang.Object