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:

Visitable

class ConcatenationOperatorNode
extends BinaryOperatorNode

This node represents a concatenation comparison operator varying.

Field Summary

Fields inherited from class 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 ValueNode

transformed

Fields inherited from class QueryTreeNode

AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

Constructors

Constructor	Description
ConcatenationOperatorNode(ValueNode leftOperand, ValueNode rightOperand, ContextManager cm)	Constructor for a ConcatenationOperatorNode

Method Summary

Modifier and Type	Method	Description
(package private) ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates)	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.
private DataTypeDescriptor	resolveConcatOperation(DataTypeDescriptor leftType, DataTypeDescriptor rightType)	Resolve a concatenation operator

Methods inherited from class BinaryOperatorNode

acceptChildren, bindXMLQuery, categorize, constantExpression, generateExpression, genSQLJavaSQLTree, getLeftOperand, getOrderableVariantType, getReceiverInterfaceName, getRightOperand, isConstantExpression, isEquivalent, isSameNodeKind, preprocess, printSubNodes, remapColumnReferencesToExpressions, setLeftOperand, setLeftRightInterfaceType, setMethodName, setOperator, setRightOperand, toString

Methods inherited from class OperatorNode

pushSqlXmlUtil

Methods inherited from class ValueNode

bindExpression, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, eliminateNots, genEqualsFalseTree, generate, genIsNullTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

Methods inherited from class 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

Methods inherited from class Object

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

Constructor Details

ConcatenationOperatorNode

ConcatenationOperatorNode(ValueNode leftOperand,
 ValueNode rightOperand,
 ContextManager cm)

Constructor for a ConcatenationOperatorNode

Parameters:

leftOperand - The left operand of the concatenation

rightOperand - The right operand of the concatenation

cm - The context manager

Method Details

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

ValueNode bindExpression(FromList fromList,
 SubqueryList subqueryList,
 List<AggregateNode> aggregates)
                  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

aggregates - The aggregate list 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