8
Query Processing
One might assume that query processing in a data integration system differs little from query processing in a traditional DBMS. After all, the query language (whether SQL, datalog, or XQuery) is based on standard relational (or extended relational) operations. Its goal remains to find an efficient executable plan for the query. While data integration queries often process distributed data, even this problem has been studied in the context of distributed and federated database systems. Despite these cursory similarities, data integration actually offers a number of challenges that require novel solutions.
Example 8.1
To ground this discussion, let us consider, as the central example in this chapter, a query to look for well-reviewed ...
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