IsNode (Apache Derby V10.14 Internals)

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.IsNode

All Implemented Interfaces:: Visitable

class IsNode
extends BinaryLogicalOperatorNode

Field Summary

Fields
Modifier and Type Field Description

private boolean notMe
- 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, 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.QueryTreeNode
  AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
- Fields inherited from class org.apache.derby.impl.sql.compile.ValueNode
  transformed

Fields
Modifier and Type	Field	Description
`private boolean`	`notMe`

Constructor Summary

Constructors
Constructor Description

IsNode(ValueNode leftOperand, ValueNode rightOperand, boolean notMe, ContextManager cm)
Constructor for an IsNode

Constructors
Constructor	Description
`IsNode(ValueNode leftOperand, ValueNode rightOperand, boolean notMe, ContextManager cm)`	Constructor for an IsNode

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) ValueNode`	`bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)`	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.
`(package private) void`	`generateExpression(ExpressionClassBuilder acb, MethodBuilder mb)`	Do code generation for this logical binary operator.
`ValueNode`	`putAndsOnTop()`	Do the 1st step in putting child expressions 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
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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

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

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

- Field Detail
  - notMe
```
private boolean notMe
```
- Constructor Detail
  - IsNode
```
IsNode(ValueNode leftOperand,
       ValueNode rightOperand,
       boolean notMe,
       ContextManager cm)
```
    Constructor for an IsNode
    
    Parameters:
    
    leftOperand - The left operand of the IS
    
    rightOperand - The right operand of the IS
    
    notMe - Whether to reverse the sense of this node.
    
    cm - The context manager
- Method Detail
  - bindExpression
```
ValueNode bindExpression(FromList fromList,
                         SubqueryList subqueryList,
                         java.util.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 class BinaryLogicalOperatorNode
    
    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
  - eliminateNots
```
ValueNode eliminateNots(boolean underNotNode)
                 throws StandardException
```
    Eliminate NotNodes in the current query block. We just mark whether this IS node is under an eliminated NOT node.
    
    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 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 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.
  - generateExpression
```
void generateExpression(ExpressionClassBuilder acb,
                        MethodBuilder mb)
                 throws StandardException
```
    Do code generation for this logical binary operator.
    
    Overrides:
    
    generateExpression in class BinaryLogicalOperatorNode
    
    Parameters:
    
    acb - The ExpressionClassBuilder for the class we're generating
    
    mb - the method the expression will go into
    
    Throws:
    
    StandardException - Thrown on error

Class IsNode

Field Summary

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

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

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

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

Constructor Summary

Method Summary

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

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

Methods inherited from class java.lang.Object

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

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

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

Field Detail

notMe

Constructor Detail

IsNode

Method Detail

bindExpression

eliminateNots

putAndsOnTop

verifyPutAndsOnTop

changeToCNF

verifyChangeToCNF

generateExpression