public class SpecialFunctionNode extends ValueNode
Functions supported:
This node is used rather than some use of MethodCallNode for runtime performance. MethodCallNode does not provide a fast access to the current language connection or activatation, since it is geared towards user defined routines.
Modifier and Type | Field and Description |
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private java.lang.String |
methodName
Java method name
|
private java.lang.String |
methodType
Return type of Java method.
|
(package private) java.lang.String |
sqlName
Name of SQL function
|
transformed
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, isPrivilegeCollectionRequired
Constructor and Description |
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SpecialFunctionNode() |
Modifier and Type | Method and Description |
---|---|
ValueNode |
bindExpression(FromList fromList,
SubqueryList subqueryList,
java.util.List aggregateVector)
Binding this special function means setting the result DataTypeServices.
|
void |
generateExpression(ExpressionClassBuilder acb,
MethodBuilder mb)
Generate an expression that returns a DataValueDescriptor and
calls a method off the language connection or the activation.
|
protected int |
getOrderableVariantType()
Return the variant type for the underlying expression.
|
protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode.
|
java.lang.String |
toString()
Convert this object to a String.
|
bindExpression, categorize, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, constantExpression, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, generateFilter, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop
accept, acceptChildren, 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, init, init, init, init, isAtomic, isInstanceOf, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, orReliability, parseStatement, printLabel, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, stackPrint, treePrint, treePrint, verifyClassExist
java.lang.String sqlName
private java.lang.String methodName
private java.lang.String methodType
public ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) throws StandardException
bindExpression
in class ValueNode
fromList
- The FROM list for the statement. This parameter
is not used in this case.subqueryList
- The subquery list being built as we find
SubqueryNodes. Not used in this case.aggregateVector
- The aggregate vector being built as we find
AggregateNodes. Not used in this case.StandardException
- Thrown on errorprotected int getOrderableVariantType()
getOrderableVariantType
in class ValueNode
public void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException
generateExpression
in class ValueNode
acb
- The ExpressionClassBuilder for the class being builtmb
- The method the code to place the codeStandardException
- Thrown on errorpublic java.lang.String toString()
ValueNode
protected boolean isEquivalent(ValueNode o)
ValueNode
This method provides basic expression matching facility for the derived class of ValueNode and it is used by the language layer to compare the node structural form of the two expressions for equivalence at bind phase.
Note that it is not comparing the actual row values at runtime to produce a result; hence, when comparing SQL NULLs, they are considered to be equivalent and not unknown.
One usage case of this method in this context is to compare the select column expression against the group by expression to check if they are equivalent. e.g.:
SELECT c1+c2 FROM t1 GROUP BY c1+c2
In general, node equivalence is determined by the derived class of ValueNode. But they generally abide to the rules below:
isEquivalent
in class ValueNode
o
- the node to compare this ValueNode against.true
if the two nodes are equivalent,
false
otherwise.Apache Derby V10.10 Internals - Copyright © 2004,2013 The Apache Software Foundation. All Rights Reserved.