pack-priv Class OrNode

Constructor for an OrNode

Parameters

leftOperand:ValueNode

The left operand of the OR

rightOperand:ValueNode

The right operand of the OR

cm:ContextManager

The context manager

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.

Annotations

@Override

Exceptions

StandardException:

Thrown on error

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

Annotations

@Override

Exceptions

StandardException:

Thrown on error

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

Eliminate NotNodes in the current query block. We traverse the tree, inverting ANDs and ORs and eliminating NOTs as we go. We stop at ComparisonOperators and boolean expressions. We invert ComparisonOperators and replace boolean expressions with boolean expression = false.

Parameters

underNotNode:boolean

Whether or not we are under a NotNode.

Returns:ValueNode

The modified expression

Annotations

@Override

Exceptions

StandardException:

Thrown on error

Do bind() by hand for an AndNode that was generated after bind(), eg by putAndsOnTop(). (Set the data type and nullability info.)

Exceptions

StandardException:

Thrown on error

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

Preprocess an expression tree. We do a number of transformations here (including subqueries, IN lists, LIKE and BETWEEN) plus subquery flattening.

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

Mark this OrNode as the 1st OR in the OR chain. We will consider converting the chain to an IN list during preprocess() if all entries are of the form: ColumnReference = expression

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.

Annotations

@Override