Class BinaryListOperatorNode
- 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.BinaryListOperatorNode
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- All Implemented Interfaces:
Visitable
- Direct Known Subclasses:
BetweenOperatorNode
,InListOperatorNode
public abstract class BinaryListOperatorNode extends ValueNode
A BinaryListOperatorNode represents a built-in "binary" operator with a single operand on the left of the operator and a list of operands on the right. This covers operators such as IN and BETWEEN.
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Field Summary
Fields Modifier and Type Field Description (package private) ValueNode
leftOperand
(package private) java.lang.String
methodName
(package private) java.lang.String
operator
(package private) ValueNodeList
rightOperandList
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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 BinaryListOperatorNode(ValueNode leftOperand, ValueNodeList rightOperandList, java.lang.String operator, java.lang.String methodName, ContextManager cm)
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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.(package private) void
bindComparisonOperator()
Test the type compatability of the operands and set the type info for this node.(package private) ValueNode
bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)
Bind this expression.(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.(package private) ValueNode
getLeftOperand()
Get the leftOperandprotected int
getOrderableVariantType()
Return the variant type for the underlying expression.(package private) ValueNodeList
getRightOperandList()
Get the rightOperandList(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) 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 ValueNode(package private) void
setRightOperandList(ValueNodeList newRightOperandList)
Set the rightOperandList to the specified ValueNodeListjava.lang.String
toString()
Convert this object to a String.-
Methods inherited from class org.apache.derby.impl.sql.compile.ValueNode
bindExpression, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, generateExpression, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeKind, 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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methodName
java.lang.String methodName
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operator
java.lang.String operator
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leftOperand
ValueNode leftOperand
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rightOperandList
ValueNodeList rightOperandList
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Constructor Detail
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BinaryListOperatorNode
BinaryListOperatorNode(ValueNode leftOperand, ValueNodeList rightOperandList, java.lang.String operator, java.lang.String methodName, ContextManager cm) throws java.lang.SecurityException
- Throws:
java.lang.SecurityException
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Method Detail
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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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bindComparisonOperator
void bindComparisonOperator() throws StandardException
Test the type compatability of the operands and set the type info for this node. This method is useful both during binding and when we generate nodes within the language module outside of the parser.- 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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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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setRightOperandList
void setRightOperandList(ValueNodeList newRightOperandList)
Set the rightOperandList to the specified ValueNodeList- Parameters:
newRightOperandList
- The new rightOperandList
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getRightOperandList
ValueNodeList getRightOperandList()
Get the rightOperandList- Returns:
- The current rightOperandList.
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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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getOrderableVariantType
protected int getOrderableVariantType() throws StandardException
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 - immutable- Overrides:
getOrderableVariantType
in classValueNode
- Returns:
- The variant type for the underlying expression.
- Throws:
StandardException
- thrown on error
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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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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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