public class CoalesceFunctionNode extends ValueNode
Modifier and Type | Field and Description |
---|---|
(package private) ValueNodeList |
argumentsList |
private int |
firstNonParameterNodeIdx
The generated method will generate code to call coalesce on
this non-parameter argument.
|
(package private) java.lang.String |
functionName |
transformed
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, isPrivilegeCollectionRequired
Constructor and Description |
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CoalesceFunctionNode() |
Modifier and Type | Method and Description |
---|---|
(package private) void |
acceptChildren(Visitor v)
Accept the visitor for all visitable children of this node.
|
ValueNode |
bindExpression(FromList fromList,
SubqueryList subqueryList,
java.util.List aggregateVector)
Binding this expression means setting the result DataTypeServices.
|
boolean |
categorize(JBitSet referencedTabs,
boolean simplePredsOnly)
Categorize this predicate.
|
void |
generateExpression(ExpressionClassBuilder acb,
MethodBuilder mb)
Do code generation for coalese/value
|
void |
init(java.lang.Object functionName,
java.lang.Object argumentsList)
Initializer for a CalesceFunctionNode
|
protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode.
|
ValueNode |
preprocess(int numTables,
FromList outerFromList,
SubqueryList outerSubqueryList,
PredicateList outerPredicateList)
Preprocess an expression tree.
|
void |
printSubNodes(int depth)
Prints the sub-nodes of this object.
|
ValueNode |
remapColumnReferencesToExpressions()
Remap all the
ColumnReference s in this tree to be clones of
the underlying expression. |
java.lang.String |
toString()
Convert this object to a String.
|
bindExpression, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, constantExpression, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, generateFilter, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getOrderableVariantType, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop
accept, 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, isAtomic, isInstanceOf, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, orReliability, parseStatement, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, stackPrint, treePrint, treePrint, verifyClassExist
java.lang.String functionName
ValueNodeList argumentsList
private int firstNonParameterNodeIdx
public void init(java.lang.Object functionName, java.lang.Object argumentsList)
init
in interface Node
init
in class QueryTreeNode
functionName
- Tells if the function was called with name COALESCE or with name VALUEargumentsList
- The list of arguments to the coalesce/value functionpublic ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) throws StandardException
bindExpression
in class ValueNode
fromList
- The FROM list for the statement.subqueryList
- The subquery list being built as we find SubqueryNodes.aggregateVector
- The aggregate vector being built as we find AggregateNodes.StandardException
- Thrown on errorpublic void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException
generateExpression
in class ValueNode
acb
- The ExpressionClassBuilder for the class we're generatingmb
- The method the expression will go intoStandardException
- Thrown on errorpublic java.lang.String toString()
ValueNode
public void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treeprotected boolean isEquivalent(ValueNode o) throws StandardException
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.StandardException
void acceptChildren(Visitor v) throws StandardException
acceptChildren
in class QueryTreeNode
v
- the visitorStandardException
- on error in the visitorpublic boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly) throws StandardException
categorize
in class ValueNode
referencedTabs
- JBitSet with bit map of referenced FromTablessimplePredsOnly
- Whether or not to consider method
calls, field references and conditional nodes
when building bit mapStandardException
- Thrown on errorValueNode.categorize(JBitSet, boolean)
public ValueNode preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) throws StandardException
preprocess
in class ValueNode
numTables
- Number of tables in the DML StatementouterFromList
- FromList from outer query blockouterSubqueryList
- SubqueryList from outer query blockouterPredicateList
- PredicateList from outer query blockStandardException
- Thrown on errorpublic ValueNode remapColumnReferencesToExpressions() throws StandardException
ColumnReference
s in this tree to be clones of
the underlying expression.remapColumnReferencesToExpressions
in class ValueNode
StandardException
- if an error occursApache Derby V10.10 Internals - Copyright © 2004,2013 The Apache Software Foundation. All Rights Reserved.