Class IsNode
- All Implemented Interfaces:
Visitable
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Field Summary
FieldsFields 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, K_BASE, K_XMLEXISTS, K_XMLQUERY, kind, LE, leftInterfaceType, leftOperand, LIKE, LT, methodName, MINUS, NE, operator, OR, PLUS, receiver, resultInterfaceType, rightInterfaceType, rightOperand, TIMES
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
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Constructor Summary
ConstructorsConstructorDescriptionIsNode
(ValueNode leftOperand, ValueNode rightOperand, boolean notMe, ContextManager cm) Constructor for an IsNode -
Method Summary
Modifier and TypeMethodDescription(package private) ValueNode
bindExpression
(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates) Bind this logical operator.changeToCNF
(boolean underTopAndNode) Finish putting an expression into conjunctive normal form.(package private) ValueNode
eliminateNots
(boolean underNotNode) Eliminate NotNodes in the current query block.(package private) void
Do code generation for this logical binary operator.Do the 1st step in putting child expressions into conjunctive normal form.boolean
Verify that changeToCNF() did its job correctly.boolean
Verify that putAndsOnTop() did its job correctly.Methods inherited from class org.apache.derby.impl.sql.compile.BinaryLogicalOperatorNode
resolveLogicalBinaryOperator, verifyEliminateNots
Methods inherited from class org.apache.derby.impl.sql.compile.BinaryOperatorNode
acceptChildren, bindXMLQuery, categorize, constantExpression, genSQLJavaSQLTree, getLeftOperand, getOrderableVariantType, getReceiverInterfaceName, getRightOperand, isConstantExpression, isEquivalent, isSameNodeKind, preprocess, 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, genIsNullTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, 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, 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
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Field Details
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notMe
private boolean notMe
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Constructor Details
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IsNode
IsNode(ValueNode leftOperand, ValueNode rightOperand, boolean notMe, ContextManager cm) Constructor for an IsNode- Parameters:
leftOperand
- The left operand of the ISrightOperand
- The right operand of the ISnotMe
- Whether to reverse the sense of this node.cm
- The context manager
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Method Details
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bindExpression
ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates) 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 classBinaryLogicalOperatorNode
- Parameters:
fromList
- The query's FROM listsubqueryList
- The subquery list being built as we find SubqueryNodesaggregates
- The aggregate list being built as we find AggregateNodes- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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eliminateNots
Eliminate NotNodes in the current query block. We just mark whether this IS node is under an eliminated NOT node.- Overrides:
eliminateNots
in classValueNode
- Parameters:
underNotNode
- Whether or not we are under a NotNode.- Returns:
- The modified expression
- Throws:
StandardException
- Thrown on error
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putAndsOnTop
Do the 1st step in putting child expressions into conjunctive normal form. This step ensures that the top level of the child expression is a chain of AndNodes terminated by a true BooleanConstantNode.- Overrides:
putAndsOnTop
in classValueNode
- Returns:
- The modified expression
- Throws:
StandardException
- Thrown on error
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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 classValueNode
- Returns:
- Boolean which reflects validity of the tree.
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changeToCNF
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 classValueNode
- Parameters:
underTopAndNode
- Whether or not we are under a top level AndNode.- Returns:
- The modified expression
- Throws:
StandardException
- Thrown on error
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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 classValueNode
- Returns:
- Boolean which reflects validity of the tree.
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generateExpression
Do code generation for this logical binary operator.- Overrides:
generateExpression
in classBinaryLogicalOperatorNode
- Parameters:
acb
- The ExpressionClassBuilder for the class we're generatingmb
- the method the expression will go into- Throws:
StandardException
- Thrown on error
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