Tue 27 Oct 2015 15:30 - 16:00 at Ellwood 1 - Session 4 Chair(s): Jeremy Gibbons

Semantic optimization – the use of data integrity constraints to optimize relational queries – has been well studied but, owing to limitations in how SQL handles constraints, has not often been applied by mainstream RDBMSs. In a language-integrated query setting, however, the query provider is free to rewrite queries before they are executed on an RDBMS. We show, using Coq as our ambient language, how to use dependent types to represent a well known class of constraints – embedded, implicational dependencies – and how Coq tactics can be used to implement a particular kind of semantic optimization: tableaux minimization, which minimizes the number of joins required by a query.

Tue 27 Oct

Displayed time zone: Eastern Time (US & Canada) change

15:30 - 17:00
Session 4DBPL at Ellwood 1
Chair(s): Jeremy Gibbons University of Oxford, UK
15:30
30m
Talk
Using Dependent Types and Tactics to Enable Semantic Optimization of Language-Integrated Queries
DBPL
16:00
30m
Talk
Relative Expressive Power of Downward Fragments of Navigational Query Languages on Trees and Chains
DBPL
Jelle Hellings Hasselt University and Transnational University of Limburg, Marc Gyssens Hasselt University and Transnational University of Limburg, Yuqing Wu Indiana University, Dirk Van Gucht Indiana University, Jan Van den Bussche Hasselt University and Transnational University of Limburg, Stijn Vansummeren Université Libre de Bruxelles, George Fletcher Eindhoven University of Technology
16:30
30m
Talk
Typing Regular Path Query Languages for Data Graphs
DBPL