Visitable
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 activation, since it is geared towards user defined routines.
Modifier and Type | Field | Description |
---|---|---|
(package private) static int |
K_CURRENT_ISOLATION |
|
(package private) static int |
K_CURRENT_ROLE |
|
(package private) static int |
K_CURRENT_SCHEMA |
|
(package private) static int |
K_CURRENT_USER |
|
(package private) static int |
K_IDENTITY_VAL |
|
(package private) static int |
K_SESSION_USER |
|
(package private) static int |
K_SYSTEM_USER |
|
(package private) static int |
K_USER |
|
(package private) int |
kind |
This class is used to hold logically different objects for
space efficiency.
|
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
|
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
transformed
Constructor | Description |
---|---|
SpecialFunctionNode(int kind,
ContextManager cm) |
Modifier and Type | Method | Description |
---|---|---|
(package private) ValueNode |
bindExpression(FromList fromList,
SubqueryList subqueryList,
java.util.List<AggregateNode> aggregates) |
Binding this special function means setting the result DataTypeServices.
|
(package private) 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.
|
(package private) boolean |
isEquivalent(ValueNode o) |
Tests if this node is equivalent to the specified ValueNode.
|
(package private) boolean |
isSameNodeKind(ValueNode o) |
Some node classes represent several logical node types (to reduce
footprint), which we call kinds.
|
java.lang.String |
toString() |
Convert this object to a String.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
accept, acceptChildren, 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, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist
bindExpression, categorize, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, constantExpression, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop
java.lang.String sqlName
static final int K_IDENTITY_VAL
static final int K_CURRENT_ISOLATION
static final int K_CURRENT_SCHEMA
static final int K_USER
static final int K_CURRENT_USER
static final int K_SESSION_USER
static final int K_SYSTEM_USER
static final int K_CURRENT_ROLE
final int kind
kind
represents the logical object
type. See also ValueNode.isSameNodeKind(org.apache.derby.impl.sql.compile.ValueNode)
.private java.lang.String methodName
private java.lang.String methodType
SpecialFunctionNode(int kind, ContextManager cm)
ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates) 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.aggregates
- The aggregate list being built as we find
AggregateNodes. Not used in this case.StandardException
- Thrown on errorprotected int getOrderableVariantType()
getOrderableVariantType
in class ValueNode
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
boolean isSameNodeKind(ValueNode o)
ValueNode
ValueNode.isEquivalent(org.apache.derby.impl.sql.compile.ValueNode)
cannot always just use instanceof
to check if the other node
represents the same kind. Hence this method needs to be
overridden by all node classes that represent several kinds.
This default implementation does not look at kinds.
It is only called from implementations of isEquivalent
.isSameNodeKind
in class ValueNode
o
- The other value node whose kind we want to compare with.true
if this
and o
represent the same
logical node type, i.e. kind.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 V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.