org.apache.derby.impl.sql.compile

Class AndNode

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.BinaryOperatorNode

org.apache.derby.impl.sql.compile.BinaryLogicalOperatorNode

org.apache.derby.impl.sql.compile.AndNode

All Implemented Interfaces:

Node, Visitable

public class AndNode
extends BinaryLogicalOperatorNode

Field Summary

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

shortCircuitValue

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

AND, BinaryArgTypes, BinaryMethodNames, BinaryOperators, BinaryResultTypes, CONCATENATE, DIVIDE, EQ, GE, GT, LE, leftInterfaceType, leftOperand, LIKE, LT, methodName, MINUS, NE, operator, operatorType, OR, PLUS, receiver, resultInterfaceType, rightInterfaceType, rightOperand, TIMES, XMLEXISTS_OP, XMLQUERY_OP

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_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

Constructors

Constructor and Description
AndNode()

Method Summary

Methods

Modifier and Type	Method and Description
ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) Bind this logical operator.
ValueNode	changeToCNF(boolean underTopAndNode) Finish putting an expression into conjunctive normal form.
(package private) ValueNode	eliminateNots(boolean underNotNode) Eliminate NotNodes in the current query block.
void	init(java.lang.Object leftOperand, java.lang.Object rightOperand) Initializer for an AndNode
(package private) void	postBindFixup() Do bind() by hand for an AndNode that was generated after bind(), eg by putAndsOnTop().
ValueNode	preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) Preprocess an expression tree.
ValueNode	putAndsOnTop() Do the 1st step in putting an expression into conjunctive normal form.
boolean	verifyChangeToCNF() Verify that changeToCNF() did its job correctly.
boolean	verifyPutAndsOnTop() Verify that putAndsOnTop() did its job correctly.

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

generateExpression, init, resolveLogicalBinaryOperator, verifyEliminateNots

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

acceptChildren, bindXMLQuery, categorize, constantExpression, genSQLJavaSQLTree, getLeftOperand, getOrderableVariantType, getReceiverInterfaceName, getRightOperand, init, init, isConstantExpression, isEquivalent, printSubNodes, remapColumnReferencesToExpressions, setLeftOperand, setLeftRightInterfaceType, setMethodName, setOperator, setRightOperand, 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, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, evaluateConstantExpressions, genEqualsFalseTree, generate, generateFilter, genIsNullTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, optimizableEqualityNode, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor

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

accept, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, foundString, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContextManager, getCursorInfo, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getNodeFactory, getNodeType, getNullNode, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, init, init, init, init, init, init, init, init, init, isAtomic, isInstanceOf, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, orReliability, parseStatement, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, stackPrint, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Constructor Detail

AndNode

public AndNode()

Method Detail

init

public void init(java.lang.Object leftOperand,
        java.lang.Object rightOperand)

Initializer for an AndNode

Specified by:

init in interface Node

Overrides:

init in class QueryTreeNode

Parameters:

leftOperand - The left operand of the AND

rightOperand - The right operand of the AND

bindExpression

public ValueNode bindExpression(FromList fromList,
                       SubqueryList subqueryList,
                       java.util.List aggregateVector)
                         throws StandardException

Bind this logical operator. All that has to be done for binding a logical operator is to bind the operands, check that both operands are BooleanDataValue, and set the result type to BooleanDataValue.

Overrides:

bindExpression in class BinaryLogicalOperatorNode

Parameters:

fromList - The query's FROM list

subqueryList - The subquery list being built as we find SubqueryNodes

aggregateVector - The aggregate vector being built as we find AggregateNodes

Returns:

The new top of the expression tree.

Throws:

StandardException - Thrown on error

preprocess

public ValueNode preprocess(int numTables,
                   FromList outerFromList,
                   SubqueryList outerSubqueryList,
                   PredicateList outerPredicateList)
                     throws StandardException

Preprocess an expression tree. We do a number of transformations here (including subqueries, IN lists, LIKE and BETWEEN) plus subquery flattening. NOTE: This is done before the outer ResultSetNode is preprocessed.

Overrides:

preprocess in class BinaryOperatorNode

Parameters:

numTables - Number of tables in the DML Statement

outerFromList - FromList from outer query block

outerSubqueryList - SubqueryList from outer query block

outerPredicateList - PredicateList from outer query block

Returns:

The modified expression

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

putAndsOnTop

public ValueNode putAndsOnTop()
                       throws StandardException

Do the 1st step in putting an expression into conjunctive normal form. This step ensures that the top level of the expression is a chain of AndNodes terminated by a true BooleanConstantNode.

Overrides:

putAndsOnTop in class ValueNode

Returns:

The modified expression

Throws:

StandardException - Thrown on error

verifyPutAndsOnTop

public boolean verifyPutAndsOnTop()

Verify that putAndsOnTop() did its job correctly. Verify that the top level of the expression is a chain of AndNodes terminated by a true BooleanConstantNode.

Overrides:

verifyPutAndsOnTop in class ValueNode

Returns:

Boolean which reflects validity of the tree.

changeToCNF

public ValueNode changeToCNF(boolean underTopAndNode)
                      throws StandardException

Finish putting an expression into conjunctive normal form. An expression tree in conjunctive normal form meets the following criteria: o If the expression tree is not null, the top level will be a chain of AndNodes terminating in a true BooleanConstantNode. o The left child of an AndNode will never be an AndNode. o Any right-linked chain that includes an AndNode will be entirely composed of AndNodes terminated by a true BooleanConstantNode. o The left child of an OrNode will never be an OrNode. o Any right-linked chain that includes an OrNode will be entirely composed of OrNodes terminated by a false BooleanConstantNode. o ValueNodes other than AndNodes and OrNodes are considered leaf nodes for purposes of expression normalization. In other words, we won't do any normalization under those nodes. In addition, we track whether or not we are under a top level AndNode. SubqueryNodes need to know this for subquery flattening.

Overrides:

changeToCNF in class ValueNode

Parameters:

underTopAndNode - Whether or not we are under a top level AndNode.

Returns:

The modified expression

Throws:

StandardException - Thrown on error

verifyChangeToCNF

public boolean verifyChangeToCNF()

Verify that changeToCNF() did its job correctly. Verify that: o AndNode - rightOperand is not instanceof OrNode leftOperand is not instanceof AndNode o OrNode - rightOperand is not instanceof AndNode leftOperand is not instanceof OrNode

Overrides:

verifyChangeToCNF in class ValueNode

Returns:

Boolean which reflects validity of the tree.

postBindFixup

void postBindFixup()
             throws StandardException

Do bind() by hand for an AndNode that was generated after bind(), eg by putAndsOnTop(). (Set the data type and nullability info.)

Throws:

StandardException - Thrown on error