Keyphrases
- complex queries
- cost model
- queries involving
- user queries
- query processing
- multiple queries
- response time
- database
- relevance feedback
- rewrite rules
- query optimization
- search engine
- join queries
- boolean queries
- database queries
- query evaluation
- range queries
- data structure
- visual query language
- casual users
- answering queries
- structured queries
- efficient processing
- query execution
- query answering
- object oriented
- nearest neighbor
- keywords
- feature selection