Package org.apache.derby.impl.sql.compile

Class UnaryComparisonOperatorNode

java.lang.Object

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

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

org.apache.derby.impl.sql.compile.OperatorNode

org.apache.derby.impl.sql.compile.UnaryOperatorNode

org.apache.derby.impl.sql.compile.UnaryComparisonOperatorNode

All Implemented Interfaces:

Visitable

Direct Known Subclasses:

IsNullNode

public abstract class UnaryComparisonOperatorNode
extends UnaryOperatorNode

This node is the superclass for all unary comparison operators, such as is null and is not null.

Field Summary

Fields inherited from class org.apache.derby.impl.sql.compile.UnaryOperatorNode

K_BASE, K_XMLPARSE, K_XMLSERIALIZE, kind, methodName, operand, operator, receiverInterfaceType, resultInterfaceType, UnaryArgTypes, UnaryMethodNames, UnaryOperators, UnaryResultTypes

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

transformed

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

AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

Constructors

Constructor	Description
UnaryComparisonOperatorNode(ValueNode operator, ContextManager cm)

Method Summary

Modifier and Type	Method	Description
(package private) void	bindComparisonOperator()	Set the type info for this node.
(package private) ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)	Bind this comparison operator.
(package private) ValueNode	eliminateNots(boolean underNotNode)	Eliminate NotNodes in the current query block.
void	generateAbsoluteColumnId(MethodBuilder mb, Optimizable optTable)
void	generateExpressionOperand(Optimizable optTable, int columnPosition, ExpressionClassBuilderInterface acbi, MethodBuilder mb)
void	generateOrderedNulls(MethodBuilder mb)
void	generateQualMethod(ExpressionClassBuilderInterface acbi, MethodBuilder mb, Optimizable optTable)
void	generateRelativeColumnId(MethodBuilder mb, Optimizable optTable)
private int	getAbsoluteColumnPosition(Optimizable optTable)	Get the absolute 0-based column position of the ColumnReference from the conglomerate for this Optimizable.
ColumnReference	getColumnOperand(Optimizable optTable)
ColumnReference	getColumnOperand(Optimizable optTable, int columnPosition)
ValueNode	getExpressionOperand(int tableNumber, int columnNumber, Optimizable ft)
(package private) abstract UnaryOperatorNode	getNegation(ValueNode operand)	Negate the comparison.
ValueNode	getOperand(ColumnReference cRef, int refSetSize, boolean otherSide)
int	getOrderableVariantType(Optimizable optTable)
int	getStartOperator(Optimizable optTable)
int	getStopOperator(Optimizable optTable)
boolean	isQualifier(Optimizable optTable, boolean forPush)
boolean	orderedNulls()
boolean	selfComparison(ColumnReference cr)

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

acceptChildren, addXmlOpMethodParams, bindOperand, bindParameter, categorize, constantExpression, generateExpression, getOperand, getOperatorString, getOrderableVariantType, getParameterOperand, getReceiverInterfaceName, isConstantExpression, isEquivalent, isSameNodeKind, preprocess, printSubNodes, remapColumnReferencesToExpressions, setMethodName, setOperator, toString

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

pushSqlXmlUtil

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

bindExpression, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

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

accept, addTag, addUDTUsagePriv, addUDTUsagePriv, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, copyTagsFrom, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContext, getContextManager, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getLongProperty, getNullNode, getOffsetOrderedNodes, getOptimizerFactory, getOptimizerTracer, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, getUDTDesc, isAtomic, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, optimizerTracingIsOn, orReliability, parseSearchCondition, parseStatement, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Constructor Detail

UnaryComparisonOperatorNode

UnaryComparisonOperatorNode(ValueNode operator,
                            ContextManager cm)
                     throws StandardException

Throws:

StandardException

Method Detail

bindExpression

ValueNode bindExpression(FromList fromList,
                         SubqueryList subqueryList,
                         java.util.List<AggregateNode> aggregates)
                  throws StandardException

Bind this comparison operator. All that has to be done for binding a comparison operator is to bind the operand and set the result type to SQLBoolean.

Overrides:

bindExpression in class UnaryOperatorNode

Parameters:

fromList - The query's FROM list

subqueryList - The subquery list being built as we find SubqueryNodes

aggregates - The aggregate list being built as we find AggregateNodes

Returns:

The new top of the expression tree.

Throws:

StandardException - Thrown on error

bindComparisonOperator

void bindComparisonOperator()
                     throws StandardException

Set the type info for this node. This method is useful both during binding and when we generate nodes within the language module outside of the parser.

Throws:

StandardException - Thrown on error

eliminateNots

ValueNode eliminateNots(boolean underNotNode)
                 throws StandardException

Eliminate NotNodes in the current query block. We traverse the tree, inverting ANDs and ORs and eliminating NOTs as we go. We stop at ComparisonOperators and boolean expressions. We invert ComparisonOperators and replace boolean expressions with boolean expression = false. NOTE: Since we do not recurse under ComparisonOperators, there still could be NotNodes left in the tree.

Overrides:

eliminateNots in class ValueNode

Parameters:

underNotNode - Whether or not we are under a NotNode.

Returns:

The modified expression

Throws:

StandardException - Thrown on error

getNegation

abstract UnaryOperatorNode getNegation(ValueNode operand)
                                throws StandardException

Negate the comparison.

Parameters:

operand - The operand of the comparison operator

Returns:

BinaryOperatorNode The negated expression

Throws:

StandardException - Thrown on error

getColumnOperand

public ColumnReference getColumnOperand(Optimizable optTable,
                                        int columnPosition)

See Also:

RelationalOperator.getColumnOperand(org.apache.derby.iapi.sql.compile.Optimizable, int)

getColumnOperand

public ColumnReference getColumnOperand(Optimizable optTable)

See Also:

RelationalOperator.getColumnOperand(org.apache.derby.iapi.sql.compile.Optimizable, int)

getOperand

public ValueNode getOperand(ColumnReference cRef,
                            int refSetSize,
                            boolean otherSide)

See Also:

RelationalOperator.getOperand(org.apache.derby.impl.sql.compile.ColumnReference, int, boolean)

selfComparison

public boolean selfComparison(ColumnReference cr)

See Also:

RelationalOperator.selfComparison(org.apache.derby.impl.sql.compile.ColumnReference)

getExpressionOperand

public ValueNode getExpressionOperand(int tableNumber,
                                      int columnNumber,
                                      Optimizable ft)

See Also:

RelationalOperator.getExpressionOperand(int, int, org.apache.derby.iapi.sql.compile.Optimizable)

generateExpressionOperand

public void generateExpressionOperand(Optimizable optTable,
                                      int columnPosition,
                                      ExpressionClassBuilderInterface acbi,
                                      MethodBuilder mb)
                               throws StandardException

Throws:

StandardException - Thrown on error

See Also:

RelationalOperator.generateExpressionOperand(org.apache.derby.iapi.sql.compile.Optimizable, int, org.apache.derby.iapi.sql.compile.ExpressionClassBuilderInterface, org.apache.derby.iapi.services.compiler.MethodBuilder)

getStartOperator

public int getStartOperator(Optimizable optTable)

See Also:

RelationalOperator.getStartOperator(org.apache.derby.iapi.sql.compile.Optimizable)

getStopOperator

public int getStopOperator(Optimizable optTable)

See Also:

RelationalOperator.getStopOperator(org.apache.derby.iapi.sql.compile.Optimizable)

generateOrderedNulls

public void generateOrderedNulls(MethodBuilder mb)

See Also:

RelationalOperator.generateOrderedNulls(org.apache.derby.iapi.services.compiler.MethodBuilder)

generateQualMethod

public void generateQualMethod(ExpressionClassBuilderInterface acbi,
                               MethodBuilder mb,
                               Optimizable optTable)
                        throws StandardException

Throws:

StandardException - Thrown on error

See Also:

RelationalOperator.generateQualMethod(org.apache.derby.iapi.sql.compile.ExpressionClassBuilderInterface, org.apache.derby.iapi.services.compiler.MethodBuilder, org.apache.derby.iapi.sql.compile.Optimizable)

generateAbsoluteColumnId

public void generateAbsoluteColumnId(MethodBuilder mb,
                                     Optimizable optTable)

See Also:

RelationalOperator.generateAbsoluteColumnId(org.apache.derby.iapi.services.compiler.MethodBuilder, org.apache.derby.iapi.sql.compile.Optimizable)

generateRelativeColumnId

public void generateRelativeColumnId(MethodBuilder mb,
                                     Optimizable optTable)

See Also:

RelationalOperator.generateRelativeColumnId(org.apache.derby.iapi.services.compiler.MethodBuilder, org.apache.derby.iapi.sql.compile.Optimizable)

getAbsoluteColumnPosition

private int getAbsoluteColumnPosition(Optimizable optTable)

Get the absolute 0-based column position of the ColumnReference from the conglomerate for this Optimizable.

Parameters:

optTable - The Optimizable

Returns:

The absolute 0-based column position of the ColumnReference

orderedNulls

public boolean orderedNulls()

See Also:

RelationalOperator.orderedNulls()

isQualifier

public boolean isQualifier(Optimizable optTable,
                           boolean forPush)

See Also:

RelationalOperator.isQualifier(org.apache.derby.iapi.sql.compile.Optimizable, boolean)

getOrderableVariantType

public int getOrderableVariantType(Optimizable optTable)
                            throws StandardException

Throws:

StandardException - thrown on error

See Also:

RelationalOperator.getOrderableVariantType(org.apache.derby.iapi.sql.compile.Optimizable)