Class TernaryOperatorNode

  • All Implemented Interfaces:
    Visitable
    Direct Known Subclasses:
    LikeEscapeOperatorNode

    class TernaryOperatorNode
    extends OperatorNode
    A TernaryOperatorNode represents a built-in ternary operators. This covers built-in functions like substr(). Java operators are not represented here: the JSQL language allows Java methods to be called from expressions, but not Java operators.
    • Field Detail

      • operator

        java.lang.String operator
      • methodName

        java.lang.String methodName
      • resultInterfaceType

        java.lang.String resultInterfaceType
      • receiverInterfaceType

        java.lang.String receiverInterfaceType
      • leftInterfaceType

        java.lang.String leftInterfaceType
      • rightInterfaceType

        java.lang.String rightInterfaceType
      • trimType

        int trimType
      • TernaryOperators

        static final java.lang.String[] TernaryOperators
      • TernaryMethodNames

        static final java.lang.String[] TernaryMethodNames
      • TernaryResultType

        static final java.lang.String[] TernaryResultType
      • TernaryArgType

        static final java.lang.String[][] TernaryArgType
    • Constructor Detail

      • TernaryOperatorNode

        TernaryOperatorNode​(ValueNode receiver,
                            ValueNode leftOperand,
                            ValueNode rightOperand,
                            int kind,
                            ContextManager cm)
        Constructor for a TernaryOperatorNode
        Parameters:
        receiver - The receiver (e.g., string being operated on in substr())
        leftOperand - The left operand of the node
        rightOperand - The right operand of the node
        kind - The kind of the operand
        cm - The context manager
      • TernaryOperatorNode

        TernaryOperatorNode​(ValueNode receiver,
                            ValueNode leftOperand,
                            ValueNode rightOperand,
                            int kind,
                            int trimType,
                            ContextManager cm)
        Constructor for a TernaryOperatorNode
        Parameters:
        receiver - The receiver (e.g., string being operated on in substr())
        leftOperand - The left operand of the node
        rightOperand - The right operand of the node
        kind - The kind of the operand
        trimType - The trim type
        cm - The context manager
    • Method Detail

      • constructorMinion

        private void constructorMinion​(ValueNode receiver,
                                       ValueNode leftOperand,
                                       ValueNode rightOperand,
                                       int trimType)
      • 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.
        Overrides:
        toString in class ValueNode
        Returns:
        This object as a String
      • 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 class QueryTreeNode
        Parameters:
        depth - The depth of this node in the tree
      • 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 class ValueNode
        Parameters:
        fromList - The FROM list for the query this expression is in, for binding columns.
        subqueryList - The subquery list being built as we find SubqueryNodes
        aggregates - The aggregate list being built as we find AggregateNodes
        Returns:
        The new top of the expression tree.
        Throws:
        StandardException - Thrown on error
      • 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 class ValueNode
        Parameters:
        numTables - Number of tables in the DML Statement
        outerFromList - FromList from outer query block
        outerSubqueryList - SubqueryList from outer query block
        outerPredicateList - PredicateList from outer query block
        Returns:
        The modified expression
        Throws:
        StandardException - Thrown on error
      • setLeftOperand

        void setLeftOperand​(ValueNode newLeftOperand)
        Set the leftOperand to the specified ValueNode
        Parameters:
        newLeftOperand - The new leftOperand
      • getLeftOperand

        ValueNode getLeftOperand()
        Get the leftOperand
        Returns:
        The current leftOperand.
      • setRightOperand

        void setRightOperand​(ValueNode newRightOperand)
        Set the rightOperand to the specified ValueNode
        Parameters:
        newRightOperand - The new rightOperand
      • getRightOperand

        ValueNode getRightOperand()
        Get the rightOperand
        Returns:
        The current rightOperand.
      • 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 class ValueNode
        Parameters:
        referencedTabs - JBitSet with bit map of referenced FromTables
        simplePredsOnly - 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
      • isConstantExpression

        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.
      • trimBind

        private ValueNode trimBind()
                            throws StandardException
        Bind trim expression. The variable receiver is the string that needs to be trimmed. The variable leftOperand is the character that needs to be trimmed from receiver.
        Returns:
        The new top of the expression tree.
        Throws:
        StandardException - Thrown on error
      • locateBind

        ValueNode locateBind()
                      throws StandardException
        Bind locate operator The variable receiver is the string which will searched The variable leftOperand is the search character that will looked in the receiver variable.
        Returns:
        The new top of the expression tree.
        Throws:
        StandardException - Thrown on error
      • bindParameter

        private boolean bindParameter​(ValueNode arg,
                                      int jdbcType)
                               throws StandardException
        This method gets called for non-character string types and hence no need to set any collation info. Collation applies only to character string types.
        Parameters:
        arg - Check if arg is a ? param and if yes, then set it's type to jdbcType if arg doesn't have a type associated with it.
        jdbcType - Associate this type with arg if arg is a ? param with no type associated with it
        Returns:
        true if arg is a ? param with no type associated with it
        Throws:
        StandardException
      • isSameNodeKind

        boolean isSameNodeKind​(ValueNode o)
        Description copied from class: ValueNode
        Some node classes represent several logical node types (to reduce footprint), which we call kinds. This means that implementations of ValueNode.isEquivalent(org.apache.derby.impl.sql.compile.ValueNode) cannot always just use instanceof to check if the other node represents the same kind. Hence this method needs to be overridden by all node classes that represent several kinds. This default implementation does not look at kinds. It is only called from implementations of isEquivalent.
        Overrides:
        isSameNodeKind in class ValueNode
        Parameters:
        o - The other value node whose kind we want to compare with.
        Returns:
        true if this and o represent the same logical node type, i.e. kind.
      • 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 class ValueNode
        Parameters:
        o - the node to compare this ValueNode against.
        Returns:
        true if the two nodes are equivalent, false otherwise.
        Throws:
        StandardException