UntypedNullConstantNode (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.sql.compile.QueryTreeNode
- - org.apache.derby.impl.sql.compile.ValueNode
  - - org.apache.derby.impl.sql.compile.ConstantNode
    - - org.apache.derby.impl.sql.compile.UntypedNullConstantNode

All Implemented Interfaces:

Visitable
```
public final class UntypedNullConstantNode
extends ConstantNode
```
An UntypedNullConstantNode represents a SQL NULL before it has been bound. The bind() operation will replace the UntypedNullConstantNodes with typed ConstantNodes.

Field Summary
- Fields inherited from class org.apache.derby.impl.sql.compile.ConstantNode
  value
- Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
  AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
- Fields inherited from class org.apache.derby.impl.sql.compile.ValueNode
  transformed

Constructor Summary

Constructors
Constructor Description

UntypedNullConstantNode(ContextManager cm)
Constructor for an UntypedNullConstantNode.

Constructors
Constructor	Description
`UntypedNullConstantNode(ContextManager cm)`	Constructor for an UntypedNullConstantNode.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) ValueNode`	`bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)`	Bind this expression.
`(package private) DataValueDescriptor`	`convertDefaultNode(DataTypeDescriptor typeDescriptor)`	Translate a Default node into a default value, given a type descriptor.
`(package private) void`	`generateConstant(ExpressionClassBuilder acb, MethodBuilder mb)`	Should never be called for UntypedNullConstantNode because we shouldn't make it to generate

Methods inherited from class org.apache.derby.impl.sql.compile.ConstantNode
constantExpression, generateExpression, getClone, getOrderableVariantType, getValue, isCloneable, isConstantExpression, isEquivalent, isNull, setValue, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
accept, acceptChildren, addTag, addUDTUsagePriv, addUDTUsagePriv, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, 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

Methods inherited from class org.apache.derby.impl.sql.compile.ValueNode
bindExpression, categorize, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeKind, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

- Constructor Detail
  - UntypedNullConstantNode
```
UntypedNullConstantNode(ContextManager cm)
```
    Constructor for an UntypedNullConstantNode. Untyped constants contain no state (not too surprising).
- Method Detail
  - generateConstant
```
void generateConstant(ExpressionClassBuilder acb,
                      MethodBuilder mb)
```
    Should never be called for UntypedNullConstantNode because we shouldn't make it to generate
    
    Specified by:
    
    generateConstant in class ConstantNode
    
    Parameters:
    
    acb - The ExpressionClassBuilder for the class being built
    
    mb - The method the expression will go into
  - convertDefaultNode
```
DataValueDescriptor convertDefaultNode(DataTypeDescriptor typeDescriptor)
                                throws StandardException
```
    Translate a Default node into a default value, given a type descriptor.
    
    Overrides:
    
    convertDefaultNode in class QueryTreeNode
    
    Parameters:
    
    typeDescriptor - A description of the required data type.
    
    Throws:
    
    StandardException - Thrown on error
  - bindExpression
```
ValueNode bindExpression(FromList fromList,
                         SubqueryList subqueryList,
                         java.util.List<AggregateNode> aggregates)
```
    Description copied from class: ConstantNode
    
    Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression. In this case, there are no sub-expressions, and the return type is already known, so this is just a stub.
    
    Overrides:
    
    bindExpression in class ConstantNode
    
    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.
    
    See Also:
    
    ValueNode.bindExpression(FromList, SubqueryList, List), This does nothing-- the node is actually bound when bindUntypedNullsToResultColumns is called.

Class UntypedNullConstantNode

Field Summary

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

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

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

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

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

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

Constructor Detail

UntypedNullConstantNode

Method Detail

generateConstant

convertDefaultNode

bindExpression