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Large Scale and Big Data
book

Large Scale and Big Data

by Sherif Sakr, Mohamed Gaber
June 2014
Intermediate to advanced content levelIntermediate to advanced
636 pages
23h 13m
English
Auerbach Publications
Content preview from Large Scale and Big Data
213Algebraic Optimization of RDF Graph Pattern Queries on MapReduce
Perfect Triplegroup: It is an unambiguous triplegroup, which contains no
properties except those in specic star patterns. Therefore, it can be con-
sidered as a valid answer for a query. The triplegroups tg
1
and tg
2
in Figure
6.13b are examples of perfect triplegroups.
Since the current TG _ GroupFilter semantics assume perfect triplegroups as
input, we need to extend its denition to deal with ambiguous triplegroups. Specically,
the TG _ GroupFilter needs to split any ambiguous triplegroup ta into a set of sub-
groups (not necessarily disjoint) representing all perfect triplegroups that are derivable
ta with respect to the query. However, care must be taken not to introduce ...
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Publisher Resources

ISBN: 9781466581500