public class ConditionalNode extends ValueNode
Modifier and Type | Field and Description |
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(package private) ValueNode |
testCondition |
(package private) ValueNodeList |
thenElseList |
(package private) boolean |
thisIsNullIfNode |
transformed
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, isPrivilegeCollectionRequired
Constructor and Description |
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ConditionalNode() |
Modifier and Type | Method and Description |
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(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)
Bind this expression.
|
boolean |
categorize(JBitSet referencedTabs,
boolean simplePredsOnly)
Categorize this predicate.
|
boolean |
constantExpression(PredicateList whereClause)
Return whether or not this expression tree represents a constant value.
|
(package private) ValueNode |
eliminateNots(boolean underNotNode)
Eliminate NotNodes in the current query block.
|
private DataTypeDescriptor |
findType(ValueNodeList thenElseList,
FromList fromList,
SubqueryList subqueryList,
java.util.List aggregateVector)
This method is a 'prebind.'
|
void |
generateExpression(ExpressionClassBuilder acb,
MethodBuilder mb)
Do code generation for this conditional expression.
|
void |
init(java.lang.Object testCondition,
java.lang.Object thenElseList,
java.lang.Object thisIsNullIfNode)
Initializer for a ConditionalNode
|
private boolean |
isCastNode(ValueNode node)
Checks if the provided node is a CastNode.
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private boolean |
isCastToChar(ValueNode node)
Checks if the provided CastNode is cast to a SQL CHAR type.
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private boolean |
isConditionalNode(ValueNode node)
Checks to see if the provided node represents
a ConditionalNode.
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boolean |
isConstantExpression()
Return whether or not this expression tree represents a constant expression.
|
protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode.
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private boolean |
isNullNode(ValueNode node)
Checks to see if the provided node represents
a parsing of an SQL NULL.
|
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.
|
private QueryTreeNode |
recastNullNode(ValueNode nodeToCast,
DataTypeDescriptor typeToUse)
recastNullNode casts the nodeToCast node to the typeToUse.
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private void |
recastNullNodes(ValueNodeList thenElseList,
DataTypeDescriptor castType,
FromList fromList,
SubqueryList subqueryList,
java.util.List aggregateVector)
This recursive method will hunt through the ValueNodeList thenElseList
looking for SQL NULL's.
|
ValueNode |
remapColumnReferencesToExpressions()
Remap all ColumnReferences in this tree to be clones of the
underlying expression.
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private boolean |
shouldCast(DataTypeDescriptor newType,
DataTypeDescriptor oldType)
Checks to see if oldType should be casted to the newType.
|
bindExpression, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, evaluateConstantExpressions, genEqualsFalseTree, generate, generateFilter, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getOrderableVariantType, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, toString, 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
ValueNode testCondition
ValueNodeList thenElseList
boolean thisIsNullIfNode
public void init(java.lang.Object testCondition, java.lang.Object thenElseList, java.lang.Object thisIsNullIfNode)
init
in interface Node
init
in class QueryTreeNode
testCondition
- The boolean test conditionthenElseList
- ValueNodeList with then and else expressionspublic void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treeprivate boolean isCastNode(ValueNode node)
node
- The node to check.private boolean isCastToChar(ValueNode node) throws StandardException
node
- The CastNode to check.StandardException
private boolean isNullNode(ValueNode node)
node
- The node to check.private boolean isConditionalNode(ValueNode node)
node
- The node to check.private boolean shouldCast(DataTypeDescriptor newType, DataTypeDescriptor oldType) throws StandardException
newType
- The type to cast oldType to if they're different.oldType
- The type that should be casted to the newType if
they're different.StandardException
private DataTypeDescriptor findType(ValueNodeList thenElseList, FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) throws StandardException
thenElseList
- The thenElseList (recursive method)fromList
- The fromList (required for Column References).StandardException
- Thrown on error.private void recastNullNodes(ValueNodeList thenElseList, DataTypeDescriptor castType, FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) throws StandardException
thenElseList
- The thenElseList to update.castType
- The type to cast SQL parsed NULL's too.fromList
- FromList to pass on to bindExpression if recast is performedsubqueryList
- SubqueryList to pass on to bindExpression if recast is performedaggregateVector
- AggregateVector to pass on to bindExpression if recast is performedStandardException
- Thrown on error.private QueryTreeNode recastNullNode(ValueNode nodeToCast, DataTypeDescriptor typeToUse) throws StandardException
nodeToCast
- The node that represents a SQL NULL value.typeToUse
- The type which the nodeToCast should be
recasted too.StandardException
- Thrown on error.public ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) throws StandardException
bindExpression
in class ValueNode
fromList
- The FROM list for the query this
expression is in, for binding columns.subqueryList
- The subquery list being built as we find SubqueryNodesaggregateVector
- The aggregate vector being built as we find AggregateNodesStandardException
- Thrown on errorpublic 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 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 errorpublic ValueNode remapColumnReferencesToExpressions() throws StandardException
remapColumnReferencesToExpressions
in class ValueNode
StandardException
- Thrown on errorpublic boolean isConstantExpression()
isConstantExpression
in class ValueNode
public boolean constantExpression(PredicateList whereClause)
ValueNode
constantExpression
in class ValueNode
ValueNode.constantExpression(org.apache.derby.impl.sql.compile.PredicateList)
ValueNode eliminateNots(boolean underNotNode) throws StandardException
eliminateNots
in class ValueNode
underNotNode
- Whether or not we are under a NotNode.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 errorvoid acceptChildren(Visitor v) throws StandardException
acceptChildren
in class QueryTreeNode
v
- the visitorStandardException
- on errorprotected 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
Apache Derby V10.10 Internals - Copyright © 2004,2013 The Apache Software Foundation. All Rights Reserved.