Keyphrases
- query processing
- query language
- query evaluation
- indexing schemes
- tree patterns
- web search engines
- response time
- tree structure
- database
- complex queries
- user queries
- query logs
- index structure
- aggregate queries
- logic programming
- indexing structure
- database queries
- efficient processing
- knowledge representation
- query patterns
- expert systems
- cost model
- retrieval systems
- parse tree
- r tree
- range queries
- information retrieval systems
- programming language
- data sources
- natural language