class BaseColumnNode extends ValueNode
Modifier and Type | Field and Description |
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private java.lang.String |
columnName |
private TableName |
tableName |
transformed
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
Constructor and Description |
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BaseColumnNode(java.lang.String columnName,
TableName tableName,
DataTypeDescriptor dtd,
ContextManager cm)
Constructor for a referenced column name
|
Modifier and Type | Method and Description |
---|---|
(package private) void |
acceptChildren(Visitor v)
Accept a visitor on all child nodes.
|
(package private) void |
generateExpression(ExpressionClassBuilder acb,
MethodBuilder mb)
Do the code generation for this node.
|
(package private) java.lang.String |
getColumnName()
Get the name of this column
|
protected int |
getOrderableVariantType()
Return the variant type for the underlying expression.
|
(package private) java.lang.String |
getSchemaName()
Get the user-supplied schema name for this column's table.
|
(package private) java.lang.String |
getTableName()
Get the user-supplied table name of this column.
|
(package private) 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, bindExpression, categorize, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, constantExpression, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getClone, getConstantValueAsObject, getDataValueFactory, getSourceResultColumn, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeKind, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop
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, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist
private java.lang.String columnName
private TableName tableName
BaseColumnNode(java.lang.String columnName, TableName tableName, DataTypeDescriptor dtd, ContextManager cm) throws StandardException
columnName
- The name of the column being referencedtableName
- The qualification for the columndtd
- Data type descriptor for the columncm
- Context managerStandardException
public java.lang.String toString()
java.lang.String getColumnName()
getColumnName
in class ValueNode
java.lang.String getTableName()
getTableName
in class ValueNode
java.lang.String getSchemaName() throws StandardException
getSchemaName
in class ValueNode
StandardException
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 errorprotected int getOrderableVariantType()
getOrderableVariantType
in class ValueNode
boolean isEquivalent(ValueNode o)
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.void acceptChildren(Visitor v) throws StandardException
QueryTreeNode
accept(v)
on all visitable fields, as well as
super.acceptChildren(v)
to make sure all visitable fields
defined by the super-class are accepted too.acceptChildren
in class QueryTreeNode
v
- the visitorStandardException
- on errors raised by the visitorApache Derby V10.13 Internals - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.