Keyphrases
- communication cost
- query processing
- database
- database queries
- data structure
- query evaluation
- data sources
- query expansion
- user interaction
- range queries
- knn
- relevance feedback
- user queries
- communication networks
- query interface
- retrieval systems
- query formulation
- original query
- aggregate queries
- boolean queries
- result set
- information sharing
- probabilistic model
- keywords
- databases