Class TernaryOperatorNode
- java.lang.Object
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- org.apache.derby.impl.sql.compile.QueryTreeNode
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- org.apache.derby.impl.sql.compile.ValueNode
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- org.apache.derby.impl.sql.compile.OperatorNode
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- org.apache.derby.impl.sql.compile.TernaryOperatorNode
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- All Implemented Interfaces:
Visitable
- Direct Known Subclasses:
LikeEscapeOperatorNode
class TernaryOperatorNode extends OperatorNode
A TernaryOperatorNode represents a built-in ternary operators. This covers built-in functions likesubstr()
. Java operators are not represented here: the JSQL language allows Java methods to be called from expressions, but not Java operators.
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Field Summary
Fields Modifier and Type Field Description (package private) static int
K_LIKE
(package private) static int
K_LOCATE
(package private) static int
K_SUBSTRING
(package private) static int
K_TIMESTAMPADD
(package private) static int
K_TIMESTAMPDIFF
(package private) static int
K_TRIM
(package private) int
kind
This class is used to hold logically different objects for space efficiency.(package private) java.lang.String
leftInterfaceType
(package private) ValueNode
leftOperand
(package private) java.lang.String
methodName
(package private) java.lang.String
operator
(package private) ValueNode
receiver
(package private) java.lang.String
receiverInterfaceType
(package private) java.lang.String
resultInterfaceType
(package private) java.lang.String
rightInterfaceType
(package private) ValueNode
rightOperand
(package private) static java.lang.String[][]
TernaryArgType
(package private) static java.lang.String[]
TernaryMethodNames
(package private) static java.lang.String[]
TernaryOperators
(package private) static java.lang.String[]
TernaryResultType
(package private) int
trimType
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Fields inherited from class org.apache.derby.impl.sql.compile.ValueNode
transformed
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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
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Constructor Summary
Constructors Constructor Description TernaryOperatorNode(ValueNode receiver, ValueNode leftOperand, ValueNode rightOperand, int kind, int trimType, ContextManager cm)
Constructor for a TernaryOperatorNodeTernaryOperatorNode(ValueNode receiver, ValueNode leftOperand, ValueNode rightOperand, int kind, ContextManager cm)
Constructor for a TernaryOperatorNode
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) void
acceptChildren(Visitor v)
Accept the visitor for all visitable children of this node.private void
bindDateTimeArg(ValueNode arg, int argNumber)
(package private) ValueNode
bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)
Bind this expression.private boolean
bindParameter(ValueNode arg, int jdbcType)
This method gets called for non-character string types and hence no need to set any collation info.protected void
bindToBuiltIn()
protected ValueNode
castArgToString(ValueNode vn)
(package private) boolean
categorize(JBitSet referencedTabs, boolean simplePredsOnly)
Categorize this predicate.(package private) boolean
constantExpression(PredicateList whereClause)
Return whether or not this expression tree represents a constant value.private void
constructorMinion(ValueNode receiver, ValueNode leftOperand, ValueNode rightOperand, int trimType)
(package private) void
generateExpression(ExpressionClassBuilder acb, MethodBuilder mb)
Do code generation for this ternary operator.(package private) ValueNode
getLeftOperand()
Get the leftOperand(package private) ValueNode
getReceiver()
(package private) ValueNode
getRightOperand()
Get the rightOperandprivate DataTypeDescriptor
getVarcharDescriptor()
(package private) boolean
isConstantExpression()
Return whether or not this expression tree represents a constant 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.(package private) ValueNode
locateBind()
Bind locate operator The variable receiver is the string which will searched The variable leftOperand is the search character that will looked in the receiver variable.(package private) ValueNode
preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList)
Preprocess an expression tree.(package private) void
printSubNodes(int depth)
Prints the sub-nodes of this object.(package private) ValueNode
remapColumnReferencesToExpressions()
Remap all ColumnReferences in this tree to be clones of the underlying expression.(package private) void
setLeftOperand(ValueNode newLeftOperand)
Set the leftOperand to the specified ValueNodeprivate void
setResultType(TypeId resultType)
(package private) void
setRightOperand(ValueNode newRightOperand)
Set the rightOperand to the specified ValueNode(package private) ValueNode
substrBind()
Bind substr expression.private void
throwBadType(java.lang.String funcName, java.lang.String type)
private ValueNode
timestampAddBind()
Bind TIMESTAMPADD expression.private ValueNode
timestampDiffBind()
Bind TIMESTAMPDIFF expression.java.lang.String
toString()
Convert this object to a String.private ValueNode
trimBind()
Bind trim expression.-
Methods inherited from class org.apache.derby.impl.sql.compile.OperatorNode
pushSqlXmlUtil
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Methods inherited from class org.apache.derby.impl.sql.compile.ValueNode
bindExpression, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getOrderableVariantType, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop
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Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
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, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist
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Field Detail
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K_TRIM
static final int K_TRIM
- See Also:
- Constant Field Values
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K_LOCATE
static final int K_LOCATE
- See Also:
- Constant Field Values
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K_SUBSTRING
static final int K_SUBSTRING
- See Also:
- Constant Field Values
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K_LIKE
static final int K_LIKE
- See Also:
- Constant Field Values
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K_TIMESTAMPADD
static final int K_TIMESTAMPADD
- See Also:
- Constant Field Values
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K_TIMESTAMPDIFF
static final int K_TIMESTAMPDIFF
- See Also:
- Constant Field Values
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kind
final int kind
This class is used to hold logically different objects for space efficiency.kind
represents the logical object type. See alsoValueNode.isSameNodeKind(org.apache.derby.impl.sql.compile.ValueNode)
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operator
java.lang.String operator
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methodName
java.lang.String methodName
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receiver
ValueNode receiver
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leftOperand
ValueNode leftOperand
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rightOperand
ValueNode rightOperand
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resultInterfaceType
java.lang.String resultInterfaceType
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receiverInterfaceType
java.lang.String receiverInterfaceType
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leftInterfaceType
java.lang.String leftInterfaceType
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rightInterfaceType
java.lang.String rightInterfaceType
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trimType
int trimType
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TernaryOperators
static final java.lang.String[] TernaryOperators
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TernaryMethodNames
static final java.lang.String[] TernaryMethodNames
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TernaryResultType
static final java.lang.String[] TernaryResultType
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TernaryArgType
static final java.lang.String[][] TernaryArgType
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Constructor Detail
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TernaryOperatorNode
TernaryOperatorNode(ValueNode receiver, ValueNode leftOperand, ValueNode rightOperand, int kind, ContextManager cm)
Constructor for a TernaryOperatorNode- Parameters:
receiver
- The receiver (e.g., string being operated on insubstr()
)leftOperand
- The left operand of the noderightOperand
- The right operand of the nodekind
- The kind of the operandcm
- The context manager
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TernaryOperatorNode
TernaryOperatorNode(ValueNode receiver, ValueNode leftOperand, ValueNode rightOperand, int kind, int trimType, ContextManager cm)
Constructor for a TernaryOperatorNode- Parameters:
receiver
- The receiver (e.g., string being operated on insubstr()
)leftOperand
- The left operand of the noderightOperand
- The right operand of the nodekind
- The kind of the operandtrimType
- The trim typecm
- The context manager
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Method Detail
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constructorMinion
private void constructorMinion(ValueNode receiver, ValueNode leftOperand, ValueNode rightOperand, int trimType)
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toString
public java.lang.String toString()
Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.
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printSubNodes
void printSubNodes(int depth)
Prints the sub-nodes of this object. See QueryTreeNode.java for how tree printing is supposed to work.- Overrides:
printSubNodes
in classQueryTreeNode
- Parameters:
depth
- The depth of this node in the tree
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bindExpression
ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates) throws StandardException
Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression.- Overrides:
bindExpression
in classValueNode
- Parameters:
fromList
- The FROM list for the query this expression is in, for binding columns.subqueryList
- The subquery list being built as we find SubqueryNodesaggregates
- The aggregate list being built as we find AggregateNodes- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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preprocess
ValueNode preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) throws StandardException
Preprocess an expression tree. We do a number of transformations here (including subqueries, IN lists, LIKE and BETWEEN) plus subquery flattening. NOTE: This is done before the outer ResultSetNode is preprocessed.- Overrides:
preprocess
in classValueNode
- Parameters:
numTables
- Number of tables in the DML StatementouterFromList
- FromList from outer query blockouterSubqueryList
- SubqueryList from outer query blockouterPredicateList
- PredicateList from outer query block- Returns:
- The modified expression
- Throws:
StandardException
- Thrown on error
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generateExpression
void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException
Do code generation for this ternary operator.- Overrides:
generateExpression
in classValueNode
- Parameters:
acb
- The ExpressionClassBuilder for the class we're generatingmb
- The method the expression will go into- Throws:
StandardException
- Thrown on error
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setLeftOperand
void setLeftOperand(ValueNode newLeftOperand)
Set the leftOperand to the specified ValueNode- Parameters:
newLeftOperand
- The new leftOperand
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getLeftOperand
ValueNode getLeftOperand()
Get the leftOperand- Returns:
- The current leftOperand.
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setRightOperand
void setRightOperand(ValueNode newRightOperand)
Set the rightOperand to the specified ValueNode- Parameters:
newRightOperand
- The new rightOperand
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getRightOperand
ValueNode getRightOperand()
Get the rightOperand- Returns:
- The current rightOperand.
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categorize
boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly) throws StandardException
Categorize this predicate. Initially, this means building a bit map of the referenced tables for each predicate. If the source of this ColumnReference (at the next underlying level) is not a ColumnReference or a VirtualColumnNode then this predicate will not be pushed down. For example, in: select * from (select 1 from s) a (x) where x = 1 we will not push down x = 1. NOTE: It would be easy to handle the case of a constant, but if the inner SELECT returns an arbitrary expression, then we would have to copy that tree into the pushed predicate, and that tree could contain subqueries and method calls. RESOLVE - revisit this issue once we have views.- Overrides:
categorize
in classValueNode
- Parameters:
referencedTabs
- JBitSet with bit map of referenced FromTablessimplePredsOnly
- Whether or not to consider method calls, field references and conditional nodes when building bit map- Returns:
- boolean Whether or not source.expression is a ColumnReference or a VirtualColumnNode.
- Throws:
StandardException
- Thrown on error
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remapColumnReferencesToExpressions
ValueNode remapColumnReferencesToExpressions() throws StandardException
Remap all ColumnReferences in this tree to be clones of the underlying expression.- Overrides:
remapColumnReferencesToExpressions
in classValueNode
- Returns:
- ValueNode The remapped expression tree.
- Throws:
StandardException
- Thrown on error
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isConstantExpression
boolean isConstantExpression()
Return whether or not this expression tree represents a constant expression.- Overrides:
isConstantExpression
in classValueNode
- Returns:
- Whether or not this expression tree represents a constant expression.
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constantExpression
boolean constantExpression(PredicateList whereClause)
Description copied from class:ValueNode
Return whether or not this expression tree represents a constant value. In this case, "constant" means that it will always evaluate to the same thing, even if it includes columns. A column is constant if it is compared to a constant expression.- Overrides:
constantExpression
in classValueNode
- Returns:
- True means this expression tree represents a constant value.
- See Also:
ValueNode.constantExpression(org.apache.derby.impl.sql.compile.PredicateList)
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acceptChildren
void acceptChildren(Visitor v) throws StandardException
Accept the visitor for all visitable children of this node.- Overrides:
acceptChildren
in classQueryTreeNode
- Parameters:
v
- the visitor- Throws:
StandardException
- on error
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trimBind
private ValueNode trimBind() throws StandardException
Bind trim expression. The variable receiver is the string that needs to be trimmed. The variable leftOperand is the character that needs to be trimmed from receiver.- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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setResultType
private void setResultType(TypeId resultType) throws StandardException
- Throws:
StandardException
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locateBind
ValueNode locateBind() throws StandardException
Bind locate operator The variable receiver is the string which will searched The variable leftOperand is the search character that will looked in the receiver variable.- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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castArgToString
protected ValueNode castArgToString(ValueNode vn) throws StandardException
- Throws:
StandardException
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substrBind
ValueNode substrBind() throws StandardException
Bind substr expression.- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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timestampAddBind
private ValueNode timestampAddBind() throws StandardException
Bind TIMESTAMPADD expression.- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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timestampDiffBind
private ValueNode timestampDiffBind() throws StandardException
Bind TIMESTAMPDIFF expression.- Returns:
- The new top of the expression tree.
- Throws:
StandardException
- Thrown on error
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bindDateTimeArg
private void bindDateTimeArg(ValueNode arg, int argNumber) throws StandardException
- Throws:
StandardException
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bindParameter
private boolean bindParameter(ValueNode arg, int jdbcType) throws StandardException
This method gets called for non-character string types and hence no need to set any collation info. Collation applies only to character string types.- Parameters:
arg
- Check if arg is a ? param and if yes, then set it's type to jdbcType if arg doesn't have a type associated with it.jdbcType
- Associate this type with arg if arg is a ? param with no type associated with it- Returns:
- true if arg is a ? param with no type associated with it
- Throws:
StandardException
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getReceiver
ValueNode getReceiver()
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throwBadType
private void throwBadType(java.lang.String funcName, java.lang.String type) throws StandardException
- Throws:
StandardException
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bindToBuiltIn
protected void bindToBuiltIn() throws StandardException
- Throws:
StandardException
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getVarcharDescriptor
private DataTypeDescriptor getVarcharDescriptor()
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isSameNodeKind
boolean isSameNodeKind(ValueNode o)
Description copied from class:ValueNode
Some node classes represent several logical node types (to reduce footprint), which we call kinds. This means that implementations ofValueNode.isEquivalent(org.apache.derby.impl.sql.compile.ValueNode)
cannot always just useinstanceof
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 ofisEquivalent
.- Overrides:
isSameNodeKind
in classValueNode
- Parameters:
o
- The other value node whose kind we want to compare with.- Returns:
true
ifthis
ando
represent the same logical node type, i.e. kind.
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isEquivalent
boolean isEquivalent(ValueNode o) throws StandardException
Description copied from class:ValueNode
Tests if this node is equivalent to the specified ValueNode. Two ValueNodes are considered equivalent if they will evaluate to the same value during query execution.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:
- The two ValueNodes must be of the same node type to be considered equivalent. e.g.: CastNode vs. CastNode - equivalent (if their args also match), ColumnReference vs CastNode - not equivalent.
- If node P contains other ValueNode(s) and so on, those node(s) must also be of the same node type to be considered equivalent.
- If node P takes a parameter list, then the number of arguments and its arguments for the two nodes must also match to be considered equivalent. e.g.: CAST(c1 as INTEGER) vs CAST(c1 as SMALLINT), they are not equivalent.
- When comparing SQL NULLs in this context, they are considered to be equivalent.
- If this does not apply or it is determined that the two nodes are not equivalent then the derived class of this method should return false; otherwise, return true.
- Specified by:
isEquivalent
in classValueNode
- Parameters:
o
- the node to compare this ValueNode against.- Returns:
true
if the two nodes are equivalent,false
otherwise.- Throws:
StandardException
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