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

Class DnfFilterOptimizer

java.lang.Object

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

All Implemented Interfaces:

IFilterOptimizer

public class DnfFilterOptimizer
extends java.lang.Object
implements IFilterOptimizer

Constructor Summary

Constructors

Constructor	Description
DnfFilterOptimizer()

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

DnfFilterOptimizer

public DnfFilterOptimizer()

Method Detail

optimize

public FilterOperator optimize(FilterOperator filter)
                        throws LogicalOptimizeException

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:

FilterOperator optimized operator

Throws:

LogicalOptimizeException - exception in DNF optimize