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A query tree is a tree structure that corresponds to a query, where leaf nodes of the tree contain nodes that access a relation and internal nodes with zero, one, or more children. The internal nodes contain the relational operators. These operators include project (depicted as ), restrict (depicted as ), and join (depicted as either or ).1 The edges of a tree represent data flow from bottom to top that is, from the leaves, which correspond to data in the database, to the root, which is the final operator producing the query results. Figure 10-1 depicts an example of a query tree. An evaluation of the query tree consists of evaluating an internal node operation whenever its operands are available and passing the results from evaluating the operation up the tree to the parent node. The evaluation terminates when the root node is evaluated and replaced by the tuples that form the result of the query. The following sections present a variant of the query tree structure for use in storing representations of queries in memory. The advantages of using this mechanism versus a relational calculus internal representation are shown in Table 10-1.

Advice to abstract pointcut before() : logPoints() { getLogger().log(Level.INFO, "Before: " + thisJoinPoint); } Use of the

In this aspect, the logPoints() pointcut is declared abstract in order to let subaspects provide a definition for it. Similarly, the abstract method getLogger() defers providing the logger object to subaspects. The advice that logs the message uses both these abstract entities to perform its task. The net effect is that the logging logic is embedded in the advice, while each subaspect will fill in the details of the log points and the log object. In the following discussion, we will see how a concrete aspect provides a definition for abstract pointcuts and methods.

The HideVisiblePivotItems code uses For Each...Next loops to set the Visible property for all pivot items in all row fields.

1. Strangely, few texts give explanations for the choice of symbol. Traditionally, represents a theta-join and represents a natural join, but most texts interchange these concepts, resulting in all joins represented using one or the other symbol (and sometimes both).

Aspects can extend classes and abstract aspects, as well as implement interfaces. As we saw in the previous section, extending an abstract aspect is a very useful mechanism that allows us to reuse prewritten aspects. These abstract aspects implement the bulk of the logic, but they contain abstract pointcuts and methods to defer the implementation of the specific details to the concrete

Yes. It is possible to prune the query tree prior to evaluating query plans. Yes. The tree can be used to execute queries by passing data up the tree. Yes. The tree lends itself well to relational algebra. Yes. Tree structures are a common data structure.

The On Error Resume Next line prevents the code from displaying an error message if it can t change the Visible property for a pivot item. Instead, it moves to the next line of code.

subaspects. Although AspectJ allows an aspect to also extend a class and to implement interfaces, it is uncommon to do so in practice. In the previous example, we looked at an abstract aspect called AbstractLogging. The following concrete aspect extends the AbstractLogging aspect and provides definitions for its abstract pointcut and method that are suitable for a banking system:

Only through application of algebraic operations. No. Requires translation to another form. No. Requires conversion. Only through designs that model the calculus.

public aspect BankLogging extends AbstractLogging { public pointcut logPoints() : call(* banking..*(..));

You d like to change some of the content in the data area of the pivot table, but when you try, you see the error message Cannot change this part of a PivotTable report.

Can it support execution Can it support relational algebra expressions Can it be implemented in database systems Can it contain data

public Logger getLogger() { return Logger.getLogger("banking"); } }

Yes. The tree nodes can contain data, No. Only the literals and operations, and expressions. variables that form the expression.

If you change a PivotTable setting programmatically, you can make temporary changes to the PivotTable data. Store the code in a regular code module. Sub ChangePTData() Dim pt As PivotTable Set pt = ActiveSheet.PivotTables(1) pt.EnableDataValueEditing = True End Sub

In this aspect, we have defined the logPoints() pointcut to capture all calls to all methods in classes that are part of the banking root package. The getLogger() method implementation returns the logger that is specific to the banking system. You can have many such subaspects, each providing the required definitions. The result is that the code in the base aspect is shared, while the subaspects can provide the application-specific details. Aspects can be embedded inside classes and interfaces as nested aspects. You embed aspects into classes and interfaces when the aspect s implementation is intimately tied to its enclosing class or interface. Since the aspect resides in the same source file, this simplifies the modifications required for the aspect s implementation when the enclosing entity changes.