Keyphrases
- user queries
- query processing
- database
- range queries
- constrained optimization
- database queries
- global constraints
- relevance feedback
- data structure
- constraint programming
- communication cost
- query execution
- response time
- query expansion
- retrieval systems
- retrieval process
- result set
- retrieval method
- original query
- geometric constraints
- indexing techniques
- vector space
- test collection
- information retrieval systems
- database systems
- databases