com.akiban.sql.parser
Class BinaryOperatorNode

java.lang.Object
  com.akiban.sql.parser.QueryTreeNode
      com.akiban.sql.parser.ValueNode
          com.akiban.sql.parser.BinaryOperatorNode

All Implemented Interfaces:

Visitable

Direct Known Subclasses:

BinaryArithmeticOperatorNode, BinaryBitOperatorNode, BinaryComparisonOperatorNode, BinaryLogicalOperatorNode, ConcatenationOperatorNode, LeftRightFuncOperatorNode, TimestampOperatorNode, TrimOperatorNode, XMLBinaryOperatorNode

public class BinaryOperatorNode
extends ValueNode

A BinaryOperatorNode represents a built-in binary operator as defined by the ANSI/ISO SQL standard. This covers operators like +, -, *, /, =, <, etc. Java operators are not represented here: the JSQL language allows Java methods to be called from expressions, but not Java operators.

Nested Class Summary

static class

BinaryOperatorNode.OperatorType

Field Summary

protected String	leftInterfaceType
protected ValueNode	leftOperand
protected String	methodName
protected String	operator
protected String	resultInterfaceType
protected String	rightInterfaceType
protected ValueNode	rightOperand

Fields inherited from class com.akiban.sql.parser.QueryTreeNode

AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

BinaryOperatorNode()

Method Summary

void	copyFrom(QueryTreeNode node) Fill this node with a deep copy of the given node.
ValueNode	getLeftOperand() Get the leftOperand
String	getMethodName()
String	getOperator()
ValueNode	getRightOperand() Get the rightOperand
void	init(Object leftOperand, Object rightOperand, Object leftInterfaceType, Object rightInterfaceType) Initialize a query tree node.
void	init(Object leftOperand, Object rightOperand, Object operator, Object methodName, Object leftInterfaceType, Object rightInterfaceType) Initializer for a BinaryOperatorNode
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.
void	printSubNodes(int depth) Prints the sub-nodes of this object.
void	setLeftOperand(ValueNode newLeftOperand) Set the leftOperand to the specified ValueNode
void	setLeftRightInterfaceType(String iType) Set the interface type for the left and right arguments.
void	setRightOperand(ValueNode newRightOperand) Set the rightOperand to the specified ValueNode
String	toString() Convert this object to a String.

Methods inherited from class com.akiban.sql.parser.ValueNode

getColumnName, getSchemaName, getSourceResultColumn, getTableName, getType, getTypeId, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, setNullability, setType

Methods inherited from class com.akiban.sql.parser.QueryTreeNode

accept, convertDefaultNode, debugFlush, debugPrint, formatNodeString, getBeginOffset, getDebugOutput, getEndOffset, getNodeFactory, getNodeType, getNullNode, getParserContext, getStatementType, getUserData, init, init, init, init, init, init, init, init, init, init, init, isInstanceOf, makeTableName, makeTableName, nodeHeader, printLabel, setBeginOffset, setDebugOutput, setEndOffset, setNodeType, setParserContext, setUserData, stackPrint, treePrint, treePrint, treePrint

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

operator

protected String operator

methodName

protected String methodName

leftOperand

protected ValueNode leftOperand

rightOperand

protected ValueNode rightOperand

leftInterfaceType

protected String leftInterfaceType

rightInterfaceType

protected String rightInterfaceType

resultInterfaceType

protected String resultInterfaceType

Constructor Detail

BinaryOperatorNode

public BinaryOperatorNode()

Method Detail

init

public void init(Object leftOperand,
                 Object rightOperand,
                 Object operator,
                 Object methodName,
                 Object leftInterfaceType,
                 Object rightInterfaceType)

Initializer for a BinaryOperatorNode

Overrides:

init in class QueryTreeNode

Parameters:

leftOperand - The left operand of the node

rightOperand - The right operand of the node

operator - The name of the operator

methodName - The name of the method to call for this operator

leftInterfaceType - The name of the interface for the left operand

rightInterfaceType - The name of the interface for the right operand

init

public void init(Object leftOperand,
                 Object rightOperand,
                 Object leftInterfaceType,
                 Object rightInterfaceType)

Description copied from class: QueryTreeNode

Initialize a query tree node.

Overrides:

init in class QueryTreeNode

copyFrom

public void copyFrom(QueryTreeNode node)
              throws StandardException

Fill this node with a deep copy of the given node.

Overrides:

copyFrom in class ValueNode

Throws:

StandardException

toString

public String toString()

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

Overrides:

toString in class ValueNode

Returns:

This object as a String

getOperator

public String getOperator()

getMethodName

public String getMethodName()

setLeftRightInterfaceType

public void setLeftRightInterfaceType(String iType)

Set the interface type for the left and right arguments. Used when we don't know the interface type until later in binding.

printSubNodes

public 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 class QueryTreeNode

Parameters:

depth - The depth of this node in the tree

setLeftOperand

public void setLeftOperand(ValueNode newLeftOperand)

Set the leftOperand to the specified ValueNode

Parameters:

newLeftOperand - The new leftOperand

getLeftOperand

public ValueNode getLeftOperand()

Get the leftOperand

Returns:

The current leftOperand.

setRightOperand

public void setRightOperand(ValueNode newRightOperand)

Set the rightOperand to the specified ValueNode

Parameters:

newRightOperand - The new rightOperand

getRightOperand

public ValueNode getRightOperand()

Get the rightOperand

Returns:

The current rightOperand.

isConstantExpression

public boolean isConstantExpression()

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

Overrides:

isConstantExpression in class ValueNode

Returns:

Whether or not this expression tree represents a constant expression.

isEquivalent

protected 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 class ValueNode

Parameters:

o - the node to compare this ValueNode against.

Returns:

true if the two nodes are equivalent, false otherwise.

Throws:

StandardException