org.apache.derby.impl.sql.compile

Class BooleanConstantNode

java.lang.Object

org.apache.derby.impl.sql.compile.QueryTreeNode

org.apache.derby.impl.sql.compile.ValueNode

org.apache.derby.impl.sql.compile.BooleanConstantNode

All Implemented Interfaces:

Visitable

public final class BooleanConstantNode
extends ValueNode

Method Summary

Modifier and Type	Method and Description
double	selectivity(Optimizable optTable) The default selectivity for value nodes is 50%.
java.lang.String	toString() Convert this object to a String.

Methods inherited from class org.apache.derby.impl.sql.compile.ValueNode

checkIsBoolean, setCollationInfo, setCollationInfo, setNullability, updatableByCursor

Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode

accept, addTag, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, createTypeDependency, getBeginOffset, getDataDictionary, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getOffsetOrderedNodes, getOptimizerFactory, getOptimizerTracer, getParameterTypes, getUDTDesc, isAtomic, makeConstantAction, makeTableName, makeTableName, optimizerTracingIsOn, orReliability, referencesSessionSchema, setBeginOffset, setEndOffset, taggedWith, treePrint

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

selectivity

public double selectivity(Optimizable optTable)

The default selectivity for value nodes is 50%. This is overridden in specific cases, such as the RelationalOperators.

Overrides:

selectivity in class ValueNode

toString

public java.lang.String toString()

Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.

Overrides:

toString in class ValueNode

Returns:

This object as a String