Könyv Bulk Evaluation of XQuery David Bednárek

Bulk Evaluation of XQuery

An all-at-once approach to user-defined functions

Szerző: David Bednárek
Nyelv: Angol
Kötés: Puha kötésű
Elérhetőség: Beszállítói készleten
Küldés 5-8 napon belül
94 102 Ft
XPath queries are usually translated into an algebra that combines traditional relational operators...

Információk a könyvről

Szerző
Nyelv
Angol
Kötés
Könyv - Puha kötésű
Kiadva
2012
oldal
172
EAN
9783659270239
Enbook ID
06885656
Súly
274
Méretek
150 x 220 x 10

Teljes leírás

XPath queries are usually translated into an algebra that combines traditional relational operators and XML-specific ones. In particular, FLWOR loops are represented using nest, unnest, join, and similar operators and their original nested-loop nature disappears, creating an opportunity for bulk evaluation and join reordering. In XQuery, two additional issues shall be handled -- tree construction and the presence of user-defined functions. The recursive nature of functions pushes the problem outside of the range of relational algebra. This book presents a novel evaluation framework based on an expanding network of relational operators, called R-program. In this environment, functions are evaluated in bulk instead of evaluating each call separately. Besides obvious advantages of bulk evaluation, R-programs also allow rearrangement of data flow across function boundaries. A set of program transformations employing these capabilities is described; together with rule-based static interprocedural analysis algorithms used to determine the applicability of the transformations.

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