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

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.ConcatenationOperatorNode

All Implemented Interfaces:

Node, Visitable

public class ConcatenationOperatorNode
extends BinaryOperatorNode

This node represents a concatenation comparison operator varying.

Field Summary

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, isPrivilegeCollectionRequired

Constructor Summary

ConcatenationOperatorNode()

Method Summary

ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) overrides BindOperatorNode.bindExpression because concatenation has special requirements for parameter binding.
private static int	clobBlobHandling(DataTypeDescriptor clobBlobType, DataTypeDescriptor otherType)
(package private) ValueNode	evaluateConstantExpressions() Check if this node always evaluates to the same value.
void	init(java.lang.Object leftOperand, java.lang.Object rightOperand) Initializer for a ConcatenationOperatorNode
private DataTypeDescriptor	resolveConcatOperation(DataTypeDescriptor leftType, DataTypeDescriptor rightType) Resolve a concatenation operator

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

acceptChildren, bindXMLQuery, categorize, constantExpression, generateExpression, genSQLJavaSQLTree, getLeftOperand, getOrderableVariantType, getReceiverInterfaceName, getRightOperand, init, init, init, isConstantExpression, isEquivalent, 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, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, eliminateNots, 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, 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, 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

ConcatenationOperatorNode

public ConcatenationOperatorNode()

Method Detail

init

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

Initializer for a ConcatenationOperatorNode

Specified by:

init in interface Node

Overrides:

init in class QueryTreeNode

Parameters:

leftOperand - The left operand of the concatenation

rightOperand - The right operand of the concatenation

evaluateConstantExpressions

ValueNode evaluateConstantExpressions()
                                throws StandardException

Check if this node always evaluates to the same value. If so, return a constant node representing the known result.

Overrides:

evaluateConstantExpressions in class ValueNode

Returns:

a constant node representing the result of this concatenation operation, or this if the result is not known up front

Throws:

StandardException - if an error occurs during evaluation

See Also:

ConstantExpressionVisitor

bindExpression

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

overrides BindOperatorNode.bindExpression because concatenation has special requirements for parameter binding.

Overrides:

bindExpression in class BinaryOperatorNode

Parameters:

fromList - The FROM list for the query this expression is in, for binding columns.

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 failure

resolveConcatOperation

private DataTypeDescriptor resolveConcatOperation(DataTypeDescriptor leftType,
                                                  DataTypeDescriptor rightType)
                                           throws StandardException

Resolve a concatenation operator

Parameters:

leftType - The DataTypeDescriptor of the left operand

rightType - The DataTypeDescriptor of the right operand

Returns:

A DataTypeDescriptor telling the result type of the concatenate operation

Throws:

StandardException - BinaryOperatorNotSupported Thrown when a BinaryOperator is not supported on the operand types.

clobBlobHandling

private static int clobBlobHandling(DataTypeDescriptor clobBlobType,
                                    DataTypeDescriptor otherType)
                             throws StandardException

Throws:

StandardException