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Generating Plans from Proofs (Paperback)
Loot Price: R1,529
Discovery Miles 15 290
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Generating Plans from Proofs (Paperback)
Series: Synthesis Lectures on Data Management
Expected to ship within 10 - 15 working days
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Query reformulation refers to a process of translating a source
query-a request for information in some high-level logic-based
language-into a target plan that abides by certain interface
restrictions. Many practical problems in data management can be
seen as instances of the reformulation problem. For example, the
problem of translating an SQL query written over a set of base
tables into another query written over a set of views; the problem
of implementing a query via translating to a program calling a set
of database APIs; the problem of implementing a query using a
collection of web services. In this book we approach query
reformulation in a very general setting that encompasses all the
problems above, by relating it to a line of research within
mathematical logic. For many decades logicians have looked at the
problem of converting "implicit definitions" into "explicit
definitions," using an approach known as interpolation. We will
review the theory of interpolation, and explain its close
connection with query reformulation. We will give a detailed look
at how the interpolation-based approach is used to generate
translations between logic-based queries over different
vocabularies, and also how it can be used to go from logic-based
queries to programs.
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