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org.apache.derby.impl.sql.compile
Class BinaryComparisonOperatorNode  

java.lang.Object
  org.apache.derby.impl.sql.compile.QueryTreeNode
      org.apache.derby.impl.sql.compile.ValueNode
          org.apache.derby.impl.sql.compile.BinaryOperatorNode
              org.apache.derby.impl.sql.compile.BinaryComparisonOperatorNode

All Implemented Interfaces:

org.apache.derby.iapi.sql.compile.Visitable

Direct Known Subclasses:

BinaryRelationalOperatorNode

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public abstract class BinaryComparisonOperatorNode

extends BinaryOperatorNode

This node is the superclass for all binary comparison operators, such as =, <>, <, etc.

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Field Summary
private  boolean	betweenSelectivity
private  boolean	forQueryRewrite

 

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

 

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

clause, dataTypeServices, IN_HAVING_CLAUSE, IN_SELECT_LIST, IN_UNKNOWN_CLAUSE, IN_WHERE_CLAUSE, transformed

 

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

AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, beginOffset, endOffset

 

Constructor Summary

BinaryComparisonOperatorNode()

 

Method Summary
void	bindComparisonOperator()           Test the type compatability of the operands and set the type info for this node.
ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.Vector aggregateVector)           Bind this comparison 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.
ValueNode	genSQLJavaSQLTree()           generate a SQL->Java->SQL conversion tree above the left and right operand of this Binary Operator Node if needed.
(package private)  boolean	getBetweenSelectivity()           Return whether or not to use the between selectivity for this node.
boolean	getForQueryRewrite()           Was this node generated in a query rewrite?
(package private)  BinaryOperatorNode	getNegation(ValueNode leftOperand, ValueNode rightOperand)           Negate the comparison.
void	init(java.lang.Object leftOperand, java.lang.Object rightOperand, java.lang.Object operator, java.lang.Object methodName)           Initializer for a BinaryComparisonOperatorNode
ValueNode	preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList)           Preprocess an expression tree.
(package private)  void	setBetweenSelectivity()           Use between selectivity when calculating the selectivity.
void	setForQueryRewrite(boolean val)           This node was generated as part of a query rewrite.

 

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

accept, bindXMLExists, categorize, constantExpression, generateExpression, getLeftOperand, getOrderableVariantType, getReceiverInterfaceName, getRightOperand, init, init, initializeResultField, isConstantExpression, printSubNodes, remapColumnReferencesToExpressions, setClause, setLeftOperand, setLeftRightInterfaceType, setMethodName, setOperator, setRightOperand, swapOperands, toString

 

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

bindExpression, checkIsBoolean, checkReliability, checkReliability, checkTopPredicatesForEqualsConditions, copyFields, genEqualsFalseTree, generate, generateFilter, genIsNullTree, getClause, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isParameterNode, isRelationalOperator, optimizableEqualityNode, putAndsOnTop, selectivity, setDescriptor, setTransformed, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

 

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

bind, convertDefaultNode, debugFlush, debugPrint, executeSchemaName, executeStatementName, formatNodeString, foundString, generate, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContextManager, getCursorInfo, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getNodeFactory, getNodeType, getNullNode, getParameterTypes, getRowEstimate, getSchemaDescriptor, getSchemaDescriptor, getSPSName, getStatementType, getTableDescriptor, getTypeCompiler, init, init, init, init, init, init, init, init, init, init, isAtomic, isInstanceOf, isSessionSchema, isSessionSchema, makeConstantAction, makeResultDescription, makeTableName, needsSavepoint, nodeHeader, optimize, parseQueryText, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, treePrint, treePrint, verifyClassExist

 

Methods inherited from class java.lang.Object

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

 

Field Detail

forQueryRewrite

private boolean forQueryRewrite

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betweenSelectivity

private boolean betweenSelectivity

Constructor Detail

BinaryComparisonOperatorNode

public BinaryComparisonOperatorNode()

Method Detail

init

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

Initializer for a BinaryComparisonOperatorNode

Overrides:

init in class BinaryOperatorNode

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setForQueryRewrite

public void setForQueryRewrite(boolean val)

This node was generated as part of a query rewrite. Bypass the normal comparability checks.

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getForQueryRewrite

public boolean getForQueryRewrite()

Was this node generated in a query rewrite?

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setBetweenSelectivity

void setBetweenSelectivity()

Use between selectivity when calculating the selectivity.

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getBetweenSelectivity

boolean getBetweenSelectivity()

Return whether or not to use the between selectivity for this node.

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bindExpression

public ValueNode bindExpression(FromList fromList,
                                SubqueryList subqueryList,
                                java.util.Vector aggregateVector)
                         throws org.apache.derby.iapi.error.StandardException

Bind this comparison operator. All that has to be done for binding a comparison operator is to bind the operands, check the compatibility of the types, and set the result type to SQLBoolean.

Overrides:

bindExpression in class BinaryOperatorNode

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bindComparisonOperator

public void bindComparisonOperator()
                            throws org.apache.derby.iapi.error.StandardException

Test the type compatability of the operands and 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.

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preprocess

public ValueNode preprocess(int numTables,
                            FromList outerFromList,
                            SubqueryList outerSubqueryList,
                            PredicateList outerPredicateList)
                     throws org.apache.derby.iapi.error.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

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eliminateNots

ValueNode eliminateNots(boolean underNotNode)
                  throws org.apache.derby.iapi.error.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

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getNegation

BinaryOperatorNode getNegation(ValueNode leftOperand,
                               ValueNode rightOperand)
                         throws org.apache.derby.iapi.error.StandardException

Negate the comparison.

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changeToCNF

public ValueNode changeToCNF(boolean underTopAndNode)
                      throws org.apache.derby.iapi.error.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

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genSQLJavaSQLTree

public ValueNode genSQLJavaSQLTree()
                            throws org.apache.derby.iapi.error.StandardException

Description copied from class: BinaryOperatorNode

generate a SQL->Java->SQL conversion tree above the left and right operand of this Binary Operator Node if needed. Subclasses can override the default behavior.

Overrides:

genSQLJavaSQLTree in class BinaryOperatorNode

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> sql >> [ compile overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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