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  • 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.
  • 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. (en)
Title
  • Bulk Evaluation of XQuery
  • Bulk Evaluation of XQuery (en)
skos:prefLabel
  • Bulk Evaluation of XQuery
  • Bulk Evaluation of XQuery (en)
skos:notation
  • RIV/00216208:11320/12:10124130!RIV13-GA0-11320___
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  • P(GAP202/10/0761)
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  • 125690
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  • RIV/00216208:11320/12:10124130
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  • query evaluation; XQuery; XML (en)
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  • [00CF990E7548]
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  • Germany
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  • Neuveden
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  • Bulk Evaluation of XQuery
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  • Bednárek, David
number of pages
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  • LAP Lambert Academic Publishing
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  • 978-3-659-27023-9
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  • 11320
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