Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.sql.compile.CastNode

Modifier and Type	Field and Description
private boolean	assignmentSemantics Method calls: Argument type has the same semantics as assignment: Section 9.2 (Store assignment).
pack-priv ValueNode	castOperand
private boolean	externallyGeneratedCastNode This variable gets set by the parser to indicate that this CAST node has been generated by the parser.
private boolean	forDataTypeFunction
pack-priv TypeId	sourceCTI
private int	targetCharType
private DataTypeDescriptor	targetUDT The original, unbound descriptor for the target type, if it is a UDT.
private TableName	udtTargetName The name of the target type if it's a UDT.

Access	Constructor and Description
pack-priv	CastNode(ValueNode The operand of the node castOperand, DataTypeDescriptor DataTypeServices (target type of cast) castTarget, ContextManager The context manager cm) Constructor for a CastNode
pack-priv	CastNode(ValueNode The operand of the node castOperand, int CHAR or VARCHAR JDBC type as target charType, int target type length charLength, ContextManager The context manager cm) Constructor for a CastNode

Method Summary

Modifier and Type	Method and Description
pack-priv void	acceptChildren(Visitor the visitor v) Overrides org.apache.derby.impl.sql.compile.QueryTreeNode.acceptChildren. Accept the visitor for all visitable children of this node.
pack-priv void	bindCastNodeOnly() Bind this node but not its child.
pack-priv ValueNode	Returns: The new top of the expression tree. bindExpression(FromList The FROM list for the query this expression is in, for binding columns. fromList, SubqueryList The subquery list being built as we find SubqueryNodes subqueryList, List<AggregateNode> The aggregate list being built as we find AggregateNodes aggregates) Overrides org.apache.derby.impl.sql.compile.ValueNode.bindExpression. Bind this expression.
pack-priv boolean	Returns: boolean Whether or not source.expression is a ColumnReference or a VirtualColumnNode. categorize(JBitSet JBitSet with bit map of referenced FromTables referencedTabs, boolean Whether or not to consider method calls, field references and conditional nodes when building bit map simplePredsOnly) Overrides org.apache.derby.impl.sql.compile.ValueNode.categorize. Categorize this predicate.
pack-priv boolean	constantExpression(PredicateList whereClause) Overrides org.apache.derby.impl.sql.compile.ValueNode.constantExpression. Return whether or not this expression tree represents a constant value.
private void	genDataValueConversion(ExpressionClassBuilder acb, MethodBuilder mb)
pack-priv void	generateExpression(ExpressionClassBuilder The ExpressionClassBuilder for the class we're generating acb, MethodBuilder The method the code to place the code mb) Overrides org.apache.derby.impl.sql.compile.ValueNode.generateExpression. Do code generation for this unary operator.
private ValueNode	Returns: The new top of the tree (this CastNode or a new Constant) getCastFromCharConstant(int The destination JDBC TypeId destJDBCTypeId) Get a constant representing the cast from a CHAR to another type.
private ValueNode	Returns: The new top of the tree (this CastNode or a new Constant) getCastFromIntegralType(long integral type as a long to cast from longValue, int The destination JDBC TypeId destJDBCTypeId) Get a constant representing the cast from an integral type to another type.
private ValueNode	Returns: The new top of the tree (this CastNode or a new Constant) getCastFromNumericType(DataValueDescriptor non-integral type a a double to cast from constantValue, int The destination JDBC TypeId destJDBCTypeId) Get a constant representing the cast from a non-integral type to another type.
pack-priv Object	Returns: An Object representing the bind time value of this expression tree. (null if not a bind time constant.) getConstantValueAsObject() Overrides org.apache.derby.impl.sql.compile.ValueNode.getConstantValueAsObject. Return an Object representing the bind time value of this expression tree.
protected int	getOrderableVariantType() Overrides org.apache.derby.impl.sql.compile.ValueNode.getOrderableVariantType. Return the variant type for the underlying expression.
pack-priv boolean	Returns: Whether or not this expression tree represents a constant expression. isConstantExpression() Overrides org.apache.derby.impl.sql.compile.ValueNode.isConstantExpression. Return whether or not this expression tree represents a constant expression.
pack-priv boolean	isEquivalent(ValueNode the node to compare this ValueNode against. o) Implements abstract org.apache.derby.impl.sql.compile.ValueNode.isEquivalent. Tests if this node is equivalent to the specified ValueNode.
pack-priv ValueNode	Returns: The modified expression preprocess(int Number of tables in the DML Statement numTables, FromList FromList from outer query block outerFromList, SubqueryList SubqueryList from outer query block outerSubqueryList, PredicateList PredicateList from outer query block outerPredicateList) Overrides org.apache.derby.impl.sql.compile.ValueNode.preprocess. Preprocess an expression tree.
pack-priv void	printSubNodes(int The depth of this node in the tree depth) Overrides org.apache.derby.impl.sql.compile.QueryTreeNode.printSubNodes. Prints the sub-nodes of this object.
pack-priv ValueNode	Returns: ValueNode The remapped expression tree. remapColumnReferencesToExpressions() Overrides org.apache.derby.impl.sql.compile.ValueNode.remapColumnReferencesToExpressions. Remap all ColumnReferences in this tree to be clones of the underlying expression.
pack-priv void	setAssignmentSemantics() Set assignmentSemantics to true.
pack-priv void	setForDataTypeFunction(boolean true to use function conversion rules b) set this to be a dataTypeScalarFunction
pack-priv void	setForExternallyGeneratedCASTnode() This method gets called by the parser to indiciate that this CAST node has been generated by the parser.
pack-priv void	setTargetUDTName(TableName the name of the target type name) Set the target type name if this is a cast to a UDT.
public String	Returns: This object as a String toString() Overrides org.apache.derby.impl.sql.compile.ValueNode.toString. Convert this object to a String.

assignmentSemantics	back to summary
private boolean assignmentSemantics Method calls: Argument type has the same semantics as assignment: Section 9.2 (Store assignment). There, General Rule 2.b.v.2 says that the database should raise an exception if truncation occurs when stuffing a string value into a VARCHAR, so make sure CAST doesn't issue warning only.

castOperand	back to summary
pack-priv ValueNode castOperand

externallyGeneratedCastNode	back to summary
private boolean externallyGeneratedCastNode This variable gets set by the parser to indicate that this CAST node has been generated by the parser. This means that we should use the collation info of the current compilation schema for this node's collation setting. If this variable does not get set to true, then it means that this CAST node has been an internally generated node and we should not touch the collation info set for this CAST node because it has been already set correctly by the class that generated this CAST node. Collation info is part of the DataTypeDescriptor that's defined on the ValueNode (the super class of this CastNode class)

forDataTypeFunction	back to summary
private boolean forDataTypeFunction

sourceCTI	back to summary
pack-priv TypeId sourceCTI

targetCharType	back to summary
private int targetCharType

targetUDT	back to summary
private DataTypeDescriptor targetUDT The original, unbound descriptor for the target type, if it is a UDT.

udtTargetName	back to summary
private TableName udtTargetName The name of the target type if it's a UDT. It is partly redundant, as the name can also be retrieved from the type descriptor. Additionally, it contains information about the location of the UDT name in the query text, which is useful if the query text needs to be rewritten. (Useful for example when rewriting a CHECK constraint definition to have fully qualified names before storing it in the dictionary.) This field is only set for explicit casts to a UDT.

CastNode	back to summary
pack-priv CastNode(ValueNode castOperand, DataTypeDescriptor castTarget, ContextManager cm) throws StandardException Constructor for a CastNode Parameters castOperand:ValueNode The operand of the node castTarget:DataTypeDescriptor DataTypeServices (target type of cast) cm:ContextManager The context manager Exceptions StandardException: Thrown on error

CastNode	back to summary
pack-priv CastNode(ValueNode castOperand, int charType, int charLength, ContextManager cm) throws StandardException Constructor for a CastNode Parameters castOperand:ValueNode The operand of the node charType:int CHAR or VARCHAR JDBC type as target charLength:int target type length cm:ContextManager The context manager Exceptions StandardException: Thrown on error

Method Detail

acceptChildren	back to summary
pack-priv void acceptChildren(Visitor v) throws StandardException Overrides org.apache.derby.impl.sql.compile.QueryTreeNode.acceptChildren. Accept the visitor for all visitable children of this node. Parameters v:Visitor the visitor Annotations @Override Exceptions StandardException: on error

acceptChildren

back to summary

pack-priv void acceptChildren(Visitor v) throws StandardException

Overrides org.apache.derby.impl.sql.compile.QueryTreeNode.acceptChildren.

Accept the visitor for all visitable children of this node.

Parameters

v:Visitor: the visitor

Annotations

@Override

Exceptions

StandardException:: on error

bindCastNodeOnly	back to summary
pack-priv void bindCastNodeOnly() throws StandardException Bind this node but not its child. Caller has already bound the child. This is useful for when we generate a CastNode during binding after having already bound the child. Exceptions StandardException: Thrown on error

bindCastNodeOnly

back to summary

pack-priv void bindCastNodeOnly() throws StandardException

Bind this node but not its child. Caller has already bound the child. This is useful for when we generate a CastNode during binding after having already bound the child.

Exceptions

StandardException:: Thrown on error

bindExpression	back to summary
pack-priv ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates) throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.bindExpression. Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression. Parameters fromList:FromList The FROM list for the query this expression is in, for binding columns. subqueryList:SubqueryList The subquery list being built as we find SubqueryNodes aggregates:List<AggregateNode> The aggregate list being built as we find AggregateNodes Returns:ValueNode The new top of the expression tree. Annotations @Override @SuppressWarnings:fallthrough Exceptions StandardException: Thrown on error

bindExpression

back to summary

pack-priv ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates) throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.bindExpression.

Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression.

Parameters

fromList:FromList: The FROM list for the query this expression is in, for binding columns.
subqueryList:SubqueryList: The subquery list being built as we find SubqueryNodes
aggregates:List<AggregateNode>: The aggregate list being built as we find AggregateNodes

Returns:ValueNode

The new top of the expression tree.

Annotations

@Override
@SuppressWarnings:fallthrough

Exceptions

StandardException:: Thrown on error

categorize	back to summary
pack-priv boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly) throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.categorize. 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. Parameters referencedTabs:JBitSet JBitSet with bit map of referenced FromTables simplePredsOnly:boolean Whether or not to consider method calls, field references and conditional nodes when building bit map Returns:boolean boolean Whether or not source.expression is a ColumnReference or a VirtualColumnNode. Annotations @Override Exceptions StandardException: Thrown on error

categorize

back to summary

pack-priv boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly) throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.categorize.

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.

Parameters

referencedTabs:JBitSet: JBitSet with bit map of referenced FromTables
simplePredsOnly:boolean: Whether or not to consider method calls, field references and conditional nodes when building bit map

Returns:boolean

boolean Whether or not source.expression is a ColumnReference or a VirtualColumnNode.

Annotations

@Override

Exceptions

StandardException:: Thrown on error

constantExpression back to summary

constantExpression	back to summary
pack-priv boolean constantExpression(PredicateList whereClause) Overrides org.apache.derby.impl.sql.compile.ValueNode.constantExpression. Doc from org.apache.derby.impl.sql.compile.ValueNode.constantExpression. 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. Returns:boolean True means this expression tree represents a constant value. Annotations @Override See Also `ValueNode#constantExpression`

pack-priv boolean constantExpression(PredicateList whereClause)

Overrides org.apache.derby.impl.sql.compile.ValueNode.constantExpression.

Doc from org.apache.derby.impl.sql.compile.ValueNode.constantExpression.

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.

Returns:boolean

True means this expression tree represents a constant value.

Annotations

@Override

See Also

ValueNode#constantExpression

genDataValueConversion	back to summary
private void genDataValueConversion(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException

generateExpression	back to summary
pack-priv void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.generateExpression. Do code generation for this unary operator. Parameters acb:ExpressionClassBuilder The ExpressionClassBuilder for the class we're generating mb:MethodBuilder The method the code to place the code Annotations @Override Exceptions StandardException: Thrown on error

generateExpression

back to summary

pack-priv void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.generateExpression.

Do code generation for this unary operator.

Parameters

acb:ExpressionClassBuilder: The ExpressionClassBuilder for the class we're generating
mb:MethodBuilder: The method the code to place the code

Annotations

@Override

Exceptions

StandardException:: Thrown on error

getCastFromCharConstant	back to summary
private ValueNode getCastFromCharConstant(int destJDBCTypeId) throws StandardException Get a constant representing the cast from a CHAR to another type. If this is not an "easy" cast to perform, then just return this cast node. Here's what we think is "easy": source destination ------ ----------- char boolean char date/time/ts char non-decimal numeric Parameters destJDBCTypeId:int The destination JDBC TypeId Returns:ValueNode The new top of the tree (this CastNode or a new Constant) Exceptions StandardException: Thrown on error

getCastFromCharConstant

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private ValueNode getCastFromCharConstant(int destJDBCTypeId) throws StandardException

Get a constant representing the cast from a CHAR to another type. If this is not an "easy" cast to perform, then just return this cast node. Here's what we think is "easy": source destination ------ ----------- char boolean char date/time/ts char non-decimal numeric

Parameters

destJDBCTypeId:int: The destination JDBC TypeId

Returns:ValueNode

The new top of the tree (this CastNode or a new Constant)

Exceptions

StandardException:: Thrown on error

getCastFromIntegralType	back to summary
private ValueNode getCastFromIntegralType(long longValue, int destJDBCTypeId) throws StandardException Get a constant representing the cast from an integral type to another type. If this is not an "easy" cast to perform, then just return this cast node. Here's what we think is "easy": source destination ------ ----------- integral type non-decimal numeric integral type char Parameters longValue:long integral type as a long to cast from destJDBCTypeId:int The destination JDBC TypeId Returns:ValueNode The new top of the tree (this CastNode or a new Constant) Exceptions StandardException: Thrown on error

getCastFromIntegralType

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private ValueNode getCastFromIntegralType(long longValue, int destJDBCTypeId) throws StandardException

Get a constant representing the cast from an integral type to another type. If this is not an "easy" cast to perform, then just return this cast node. Here's what we think is "easy": source destination ------ ----------- integral type non-decimal numeric integral type char

Parameters

longValue:long: integral type as a long to cast from
destJDBCTypeId:int: The destination JDBC TypeId

Returns:ValueNode

The new top of the tree (this CastNode or a new Constant)

Exceptions

StandardException:: Thrown on error

getCastFromNumericType	back to summary
private ValueNode getCastFromNumericType(DataValueDescriptor constantValue, int destJDBCTypeId) throws StandardException Get a constant representing the cast from a non-integral type to another type. If this is not an "easy" cast to perform, then just return this cast node. Here's what we think is "easy": source destination ------ ----------- non-integral type non-decimal numeric non-integral type char Parameters constantValue:DataValueDescriptor non-integral type a a double to cast from destJDBCTypeId:int The destination JDBC TypeId Returns:ValueNode The new top of the tree (this CastNode or a new Constant) Exceptions StandardException: Thrown on error

getCastFromNumericType

back to summary

private ValueNode getCastFromNumericType(DataValueDescriptor constantValue, int destJDBCTypeId) throws StandardException

Get a constant representing the cast from a non-integral type to another type. If this is not an "easy" cast to perform, then just return this cast node. Here's what we think is "easy": source destination ------ ----------- non-integral type non-decimal numeric non-integral type char

Parameters

constantValue:DataValueDescriptor: non-integral type a a double to cast from
destJDBCTypeId:int: The destination JDBC TypeId

Returns:ValueNode

The new top of the tree (this CastNode or a new Constant)

Exceptions

StandardException:: Thrown on error

getConstantValueAsObject	back to summary
pack-priv Object getConstantValueAsObject() throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.getConstantValueAsObject. Return an Object representing the bind time value of this expression tree. If the expression tree does not evaluate to a constant at bind time then we return null. This is useful for bind time resolution of VTIs. Resolve What do we do for primitives? Returns:Object An Object representing the bind time value of this expression tree. (null if not a bind time constant.) Annotations @Override Exceptions StandardException: Thrown on error

getConstantValueAsObject

back to summary

pack-priv Object getConstantValueAsObject() throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.getConstantValueAsObject.

Return an Object representing the bind time value of this expression tree. If the expression tree does not evaluate to a constant at bind time then we return null. This is useful for bind time resolution of VTIs.

Resolve

What do we do for primitives?

Returns:Object

An Object representing the bind time value of this expression tree. (null if not a bind time constant.)

Annotations

@Override

Exceptions

StandardException:: Thrown on error

getOrderableVariantType	back to summary
protected int getOrderableVariantType() throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.getOrderableVariantType. Doc from org.apache.derby.impl.sql.compile.ValueNode.getOrderableVariantType. Return the variant type for the underlying expression. The variant type can be: VARIANT - variant within a scan (method calls and non-static field access) SCAN_INVARIANT - invariant within a scan (column references from outer tables) QUERY_INVARIANT - invariant within the life of a query (constant expressions) Returns:int The variant type for the underlying expression. Exceptions StandardException: Thrown on error

getOrderableVariantType

back to summary

protected int getOrderableVariantType() throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.getOrderableVariantType.

Doc from org.apache.derby.impl.sql.compile.ValueNode.getOrderableVariantType.

Return the variant type for the underlying expression. The variant type can be: VARIANT - variant within a scan (method calls and non-static field access) SCAN_INVARIANT - invariant within a scan (column references from outer tables) QUERY_INVARIANT - invariant within the life of a query (constant expressions)

Returns:int

The variant type for the underlying expression.

Exceptions

StandardException:: Thrown on error

isConstantExpression	back to summary
pack-priv boolean isConstantExpression() Overrides org.apache.derby.impl.sql.compile.ValueNode.isConstantExpression. Return whether or not this expression tree represents a constant expression. Returns:boolean Whether or not this expression tree represents a constant expression. Annotations @Override

isConstantExpression

back to summary

pack-priv boolean isConstantExpression()

Overrides org.apache.derby.impl.sql.compile.ValueNode.isConstantExpression.

Return whether or not this expression tree represents a constant expression.

Returns:boolean

Whether or not this expression tree represents a constant expression.

Annotations

@Override

isEquivalent back to summary

isEquivalent	back to summary
pack-priv boolean isEquivalent(ValueNode o) throws StandardException Implements abstract org.apache.derby.impl.sql.compile.ValueNode.isEquivalent. Doc from org.apache.derby.impl.sql.compile.ValueNode.isEquivalent. 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. Parameters o:ValueNode the node to compare this ValueNode against. Returns:boolean `true` if the two nodes are equivalent, `false` otherwise.

pack-priv boolean isEquivalent(ValueNode o) throws StandardException

Implements abstract org.apache.derby.impl.sql.compile.ValueNode.isEquivalent.

Doc from org.apache.derby.impl.sql.compile.ValueNode.isEquivalent.

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.

Parameters

o:ValueNode: the node to compare this ValueNode against.

Returns:boolean

true if the two nodes are equivalent, false otherwise.

preprocess	back to summary
pack-priv ValueNode preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.preprocess. 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. Parameters numTables:int Number of tables in the DML Statement outerFromList:FromList FromList from outer query block outerSubqueryList:SubqueryList SubqueryList from outer query block outerPredicateList:PredicateList PredicateList from outer query block Returns:ValueNode The modified expression Annotations @Override Exceptions StandardException: Thrown on error

preprocess

back to summary

pack-priv ValueNode preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.preprocess.

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.

Parameters

numTables:int: Number of tables in the DML Statement
outerFromList:FromList: FromList from outer query block
outerSubqueryList:SubqueryList: SubqueryList from outer query block
outerPredicateList:PredicateList: PredicateList from outer query block

Returns:ValueNode

The modified expression

Annotations

@Override

Exceptions

StandardException:: Thrown on error

printSubNodes	back to summary
pack-priv void printSubNodes(int depth) Overrides org.apache.derby.impl.sql.compile.QueryTreeNode.printSubNodes. Prints the sub-nodes of this object. See QueryTreeNode.java for how tree printing is supposed to work. Parameters depth:int The depth of this node in the tree Annotations @Override

printSubNodes

back to summary

pack-priv void printSubNodes(int depth)

Overrides org.apache.derby.impl.sql.compile.QueryTreeNode.printSubNodes.

Prints the sub-nodes of this object. See QueryTreeNode.java for how tree printing is supposed to work.

Parameters

depth:int: The depth of this node in the tree

Annotations

@Override

remapColumnReferencesToExpressions	back to summary
pack-priv ValueNode remapColumnReferencesToExpressions() throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.remapColumnReferencesToExpressions. Remap all ColumnReferences in this tree to be clones of the underlying expression. Returns:ValueNode ValueNode The remapped expression tree. Annotations @Override Exceptions StandardException: Thrown on error

remapColumnReferencesToExpressions

back to summary

pack-priv ValueNode remapColumnReferencesToExpressions() throws StandardException

Overrides org.apache.derby.impl.sql.compile.ValueNode.remapColumnReferencesToExpressions.

Remap all ColumnReferences in this tree to be clones of the underlying expression.

Returns:ValueNode

ValueNode The remapped expression tree.

Annotations

@Override

Exceptions

StandardException:: Thrown on error

setAssignmentSemantics	back to summary
pack-priv void setAssignmentSemantics() Set assignmentSemantics to true. Used by method calls for casting actual arguments

setForDataTypeFunction	back to summary
pack-priv void setForDataTypeFunction(boolean b) set this to be a dataTypeScalarFunction Parameters b:boolean true to use function conversion rules

setForDataTypeFunction

back to summary

pack-priv void setForDataTypeFunction(boolean b)

set this to be a dataTypeScalarFunction

Parameters

b:boolean: true to use function conversion rules

setForExternallyGeneratedCASTnode	back to summary
pack-priv void setForExternallyGeneratedCASTnode() This method gets called by the parser to indiciate that this CAST node has been generated by the parser. This means that we should use the collation info of the current compilation schmea for this node's collation setting. If this method does not get called, then it means that this CAST node has been an internally generated node and we should not touch the collation of this CAST node because it has been already set correctly by the class that generated this CAST node.

setForExternallyGeneratedCASTnode

back to summary

pack-priv void setForExternallyGeneratedCASTnode()

This method gets called by the parser to indiciate that this CAST node has been generated by the parser. This means that we should use the collation info of the current compilation schmea for this node's collation setting. If this method does not get called, then it means that this CAST node has been an internally generated node and we should not touch the collation of this CAST node because it has been already set correctly by the class that generated this CAST node.

setTargetUDTName	back to summary
pack-priv void setTargetUDTName(TableName name) Set the target type name if this is a cast to a UDT. Parameters name:TableName the name of the target type

setTargetUDTName

back to summary

pack-priv void setTargetUDTName(TableName name)

Set the target type name if this is a cast to a UDT.

Parameters

name:TableName: the name of the target type

toString	back to summary
public String toString() Overrides org.apache.derby.impl.sql.compile.ValueNode.toString. Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing. Returns:String This object as a String Annotations @Override

toString

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public String toString()

Overrides org.apache.derby.impl.sql.compile.ValueNode.toString.

Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.

Returns:String

This object as a String

Annotations

@Override

pack-priv Class CastNode

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