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

Modifier and Type	Field and Description
private boolean	notMe

Access	Constructor and Description
pack-priv	IsNode(ValueNode The left operand of the IS leftOperand, ValueNode The right operand of the IS rightOperand, boolean Whether to reverse the sense of this node. notMe, ContextManager The context manager cm) Constructor for an IsNode

Method Summary

Modifier and Type	Method and Description
pack-priv ValueNode	Returns: The new top of the expression tree. bindExpression(FromList The query's FROM list 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.BinaryLogicalOperatorNode.bindExpression. Bind this logical operator.
public ValueNode	Returns: The modified expression changeToCNF(boolean Whether or not we are under a top level AndNode. underTopAndNode) Overrides org.apache.derby.impl.sql.compile.ValueNode.changeToCNF. Finish putting an expression into conjunctive normal form.
pack-priv ValueNode	Returns: The modified expression eliminateNots(boolean Whether or not we are under a NotNode. underNotNode) Overrides org.apache.derby.impl.sql.compile.ValueNode.eliminateNots. Eliminate NotNodes in the current query block.
pack-priv void	generateExpression(ExpressionClassBuilder The ExpressionClassBuilder for the class we're generating acb, MethodBuilder the method the expression will go into mb) Overrides org.apache.derby.impl.sql.compile.BinaryLogicalOperatorNode.generateExpression. Do code generation for this logical binary operator.
public ValueNode	Returns: The modified expression putAndsOnTop() Overrides org.apache.derby.impl.sql.compile.ValueNode.putAndsOnTop. Do the 1st step in putting child expressions into conjunctive normal form.
public boolean	Returns: Boolean which reflects validity of the tree. verifyChangeToCNF() Overrides org.apache.derby.impl.sql.compile.ValueNode.verifyChangeToCNF. Verify that changeToCNF() did its job correctly.
public boolean	Returns: Boolean which reflects validity of the tree. verifyPutAndsOnTop() Overrides org.apache.derby.impl.sql.compile.ValueNode.verifyPutAndsOnTop. Verify that putAndsOnTop() did its job correctly.

Inherited from org.apache.derby.impl.sql.compile.BinaryLogicalOperatorNode:: resolveLogicalBinaryOperator verifyEliminateNots

notMe	back to summary
private boolean notMe

IsNode	back to summary
pack-priv IsNode(ValueNode leftOperand, ValueNode rightOperand, boolean notMe, ContextManager cm) Constructor for an IsNode Parameters leftOperand:ValueNode The left operand of the IS rightOperand:ValueNode The right operand of the IS notMe:boolean Whether to reverse the sense of this node. cm:ContextManager The context manager

Method Detail

bindExpression	back to summary
pack-priv ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates) throws StandardException Overrides org.apache.derby.impl.sql.compile.BinaryLogicalOperatorNode.bindExpression. Bind this logical operator. All that has to be done for binding a logical operator is to bind the operands, check that both operands are BooleanDataValue, and set the result type to BooleanDataValue. Parameters fromList:FromList The query's FROM list 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. Exceptions StandardException: Thrown on error

bindExpression

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

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

Bind this logical operator. All that has to be done for binding a logical operator is to bind the operands, check that both operands are BooleanDataValue, and set the result type to BooleanDataValue.

Parameters

fromList:FromList: The query's FROM list
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.

Exceptions

StandardException:: Thrown on error

changeToCNF	back to summary
public ValueNode changeToCNF(boolean underTopAndNode) throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.changeToCNF. Finish putting an expression into conjunctive normal form. An expression tree in conjunctive normal form meets the following criteria: o If the expression tree is not null, the top level will be a chain of AndNodes terminating in a true BooleanConstantNode. o The left child of an AndNode will never be an AndNode. o Any right-linked chain that includes an AndNode will be entirely composed of AndNodes terminated by a true BooleanConstantNode. o The left child of an OrNode will never be an OrNode. o Any right-linked chain that includes an OrNode will be entirely composed of OrNodes terminated by a false BooleanConstantNode. o ValueNodes other than AndNodes and OrNodes are considered leaf nodes for purposes of expression normalization. In other words, we won't do any normalization under those nodes. In addition, we track whether or not we are under a top level AndNode. SubqueryNodes need to know this for subquery flattening. Parameters underTopAndNode:boolean Whether or not we are under a top level AndNode. Returns:ValueNode The modified expression Exceptions StandardException: Thrown on error

changeToCNF

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public ValueNode changeToCNF(boolean underTopAndNode) throws StandardException

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

Finish putting an expression into conjunctive normal form. An expression tree in conjunctive normal form meets the following criteria: o If the expression tree is not null, the top level will be a chain of AndNodes terminating in a true BooleanConstantNode. o The left child of an AndNode will never be an AndNode. o Any right-linked chain that includes an AndNode will be entirely composed of AndNodes terminated by a true BooleanConstantNode. o The left child of an OrNode will never be an OrNode. o Any right-linked chain that includes an OrNode will be entirely composed of OrNodes terminated by a false BooleanConstantNode. o ValueNodes other than AndNodes and OrNodes are considered leaf nodes for purposes of expression normalization. In other words, we won't do any normalization under those nodes. In addition, we track whether or not we are under a top level AndNode. SubqueryNodes need to know this for subquery flattening.

Parameters

underTopAndNode:boolean: Whether or not we are under a top level AndNode.

Returns:ValueNode

The modified expression

Exceptions

StandardException:: Thrown on error

eliminateNots	back to summary
pack-priv ValueNode eliminateNots(boolean underNotNode) throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.eliminateNots. Eliminate NotNodes in the current query block. We just mark whether this IS node is under an eliminated NOT node. Parameters underNotNode:boolean Whether or not we are under a NotNode. Returns:ValueNode The modified expression Exceptions StandardException: Thrown on error

eliminateNots

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pack-priv ValueNode eliminateNots(boolean underNotNode) throws StandardException

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

Eliminate NotNodes in the current query block. We just mark whether this IS node is under an eliminated NOT node.

Parameters

underNotNode:boolean: Whether or not we are under a NotNode.

Returns:ValueNode

The modified expression

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.BinaryLogicalOperatorNode.generateExpression. Do code generation for this logical binary operator. Parameters acb:ExpressionClassBuilder The ExpressionClassBuilder for the class we're generating mb:MethodBuilder the method the expression will go into Exceptions StandardException: Thrown on error

generateExpression

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

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

Do code generation for this logical binary operator.

Parameters

acb:ExpressionClassBuilder: The ExpressionClassBuilder for the class we're generating
mb:MethodBuilder: the method the expression will go into

Exceptions

StandardException:: Thrown on error

putAndsOnTop	back to summary
public ValueNode putAndsOnTop() throws StandardException Overrides org.apache.derby.impl.sql.compile.ValueNode.putAndsOnTop. Do the 1st step in putting child expressions into conjunctive normal form. This step ensures that the top level of the child expression is a chain of AndNodes terminated by a true BooleanConstantNode. Returns:ValueNode The modified expression Exceptions StandardException: Thrown on error

putAndsOnTop

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public ValueNode putAndsOnTop() throws StandardException

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

Do the 1st step in putting child expressions into conjunctive normal form. This step ensures that the top level of the child expression is a chain of AndNodes terminated by a true BooleanConstantNode.

Returns:ValueNode

The modified expression

Exceptions

StandardException:: Thrown on error

verifyChangeToCNF	back to summary
public boolean verifyChangeToCNF() Overrides org.apache.derby.impl.sql.compile.ValueNode.verifyChangeToCNF. Verify that changeToCNF() did its job correctly. Verify that: o AndNode - rightOperand is not instanceof OrNode leftOperand is not instanceof AndNode o OrNode - rightOperand is not instanceof AndNode leftOperand is not instanceof OrNode Returns:boolean Boolean which reflects validity of the tree.

verifyChangeToCNF

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public boolean verifyChangeToCNF()

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

Verify that changeToCNF() did its job correctly. Verify that: o AndNode - rightOperand is not instanceof OrNode leftOperand is not instanceof AndNode o OrNode - rightOperand is not instanceof AndNode leftOperand is not instanceof OrNode

Returns:boolean: Boolean which reflects validity of the tree.

verifyPutAndsOnTop	back to summary
public boolean verifyPutAndsOnTop() Overrides org.apache.derby.impl.sql.compile.ValueNode.verifyPutAndsOnTop. Verify that putAndsOnTop() did its job correctly. Verify that the top level of the expression is a chain of AndNodes terminated by a true BooleanConstantNode. Returns:boolean Boolean which reflects validity of the tree.

verifyPutAndsOnTop

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public boolean verifyPutAndsOnTop()

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

Verify that putAndsOnTop() did its job correctly. Verify that the top level of the expression is a chain of AndNodes terminated by a true BooleanConstantNode.

Returns:boolean: Boolean which reflects validity of the tree.

pack-priv Class IsNode

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