org.apache.iotdb.spark.tsfile.qp.optimizer

类 DNFFilterOptimizer

java.lang.Object

org.apache.iotdb.spark.tsfile.qp.optimizer.DNFFilterOptimizer

所有已实现的接口:

IFilterOptimizer

public class DNFFilterOptimizer
extends Object
implements IFilterOptimizer

构造器概要

构造器

构造器和说明
DNFFilterOptimizer()

方法概要

限定符和类型	方法和说明
FilterOperator	optimize(FilterOperator filter) get DNF(disjunctive normal form) for this filter operator tree.

从类继承的方法 java.lang.Object

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

构造器详细资料

DNFFilterOptimizer

public DNFFilterOptimizer()

方法详细资料

optimize

public FilterOperator optimize(FilterOperator filter)
                        throws DNFOptimizeException

get DNF(disjunctive normal form) for this filter operator tree. Before invoking getDNF function, make sure that operator tree must be binary tree. In other words, each non-leaf node has exactly two children.

指定者:

optimize 在接口中 IFilterOptimizer

参数:

filter - filter operator to be optimized

返回:

FilterOperator

抛出:

DNFOptimizeException - exception in DNF optimizing