Package org.apache.iotdb.db.qp.strategy.optimizer

Class RemoveNotOptimizer

java.lang.Object

org.apache.iotdb.db.qp.strategy.optimizer.RemoveNotOptimizer

All Implemented Interfaces:

IFilterOptimizer

public class RemoveNotOptimizer
extends java.lang.Object
implements IFilterOptimizer

Constructor Summary

Constructors

Constructor	Description
RemoveNotOptimizer()

Method Summary

Modifier and Type	Method	Description
FilterOperator	optimize(FilterOperator filter)	get DNF(disjunctive normal form) for this filter operator tree.

Methods inherited from class java.lang.Object

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

Constructor Detail

RemoveNotOptimizer

public RemoveNotOptimizer()

Method Detail

optimize

public FilterOperator optimize(FilterOperator filter)
                        throws LogicalOperatorException

get DNF(disjunctive normal form) for this filter operator tree. Before getDNF, this op tree must be binary, in another word, each non-leaf node has exactly two children.

Specified by:

optimize in interface IFilterOptimizer

Returns:

optimized operator

Throws:

LogicalOperatorException - exception in RemoveNot optimizing