Keyphrases
- query processing
- response time
- database queries
- database
- user queries
- data sources
- result set
- query evaluation
- range queries
- query execution
- query expansion
- retrieval accuracy
- retrieval systems
- vector space
- object retrieval
- search engine
- original query
- answering queries
- attribute values
- complex queries
- active learning
- relational databases
- keywords
- database systems
- data sets