Merge commit 'd803bfe2b1fe7f5e219e50ac20d6801a0a58ac75' as 'vendor/ruvector'

vendor/ruvector/examples/graph/cypher_queries.rs

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+//! Cypher Query Examples
+//!
+//! This example demonstrates Neo4j-compatible Cypher queries:
+//! - CREATE: Creating nodes and relationships
+//! - MATCH: Pattern matching
+//! - WHERE: Filtering results
+//! - RETURN: Projecting results
+//! - Aggregations and complex queries
+
+fn main() {
+    println!("=== RuVector Graph - Cypher Queries ===\n");
+
+    // TODO: Once the graph API is exposed, implement:
+
+    println!("1. Simple CREATE Query");
+    // let query = "CREATE (n:Person {name: 'Charlie', age: 28}) RETURN n";
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n2. Pattern Matching");
+    // let query = r#"
+    //     MATCH (p:Person)
+    //     WHERE p.age > 25
+    //     RETURN p.name, p.age
+    //     ORDER BY p.age DESC
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n3. Creating Relationships");
+    // let query = r#"
+    //     MATCH (a:Person {name: 'Alice'})
+    //     MATCH (b:Person {name: 'Charlie'})
+    //     CREATE (a)-[r:KNOWS {since: 2023}]->(b)
+    //     RETURN r
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n4. Traversal Queries");
+    // let query = r#"
+    //     MATCH (start:Person {name: 'Alice'})-[:KNOWS*1..3]->(end:Person)
+    //     RETURN end.name, length((start)-[:KNOWS*]->(end)) as distance
+    //     ORDER BY distance
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n5. Aggregation Queries");
+    // let query = r#"
+    //     MATCH (p:Person)
+    //     RETURN
+    //         count(p) as total_people,
+    //         avg(p.age) as average_age,
+    //         min(p.age) as youngest,
+    //         max(p.age) as oldest
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n6. Shortest Path");
+    // let query = r#"
+    //     MATCH path = shortestPath(
+    //         (a:Person {name: 'Alice'})-[:KNOWS*]-(b:Person {name: 'Bob'})
+    //     )
+    //     RETURN path, length(path) as distance
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n7. Pattern Comprehension");
+    // let query = r#"
+    //     MATCH (p:Person)
+    //     RETURN p.name, [(p)-[:KNOWS]->(friend) | friend.name] as friends
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n8. Complex Multi-Pattern Query");
+    // let query = r#"
+    //     MATCH (p:Person)-[:LIVES_IN]->(city:City)
+    //     MATCH (p)-[:WORKS_AT]->(company:Company)
+    //     WHERE city.name = 'San Francisco' AND company.industry = 'Tech'
+    //     RETURN p.name, company.name, p.salary
+    //     ORDER BY p.salary DESC
+    //     LIMIT 10
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n9. Updating Properties with Cypher");
+    // let query = r#"
+    //     MATCH (p:Person {name: 'Alice'})
+    //     SET p.age = p.age + 1, p.updated_at = timestamp()
+    //     RETURN p
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n10. Conditional Creation (MERGE)");
+    // let query = r#"
+    //     MERGE (p:Person {email: 'alice@example.com'})
+    //     ON CREATE SET p.name = 'Alice', p.created_at = timestamp()
+    //     ON MATCH SET p.last_seen = timestamp()
+    //     RETURN p
+    // "#;
+    // let result = db.execute_cypher(query)?;
+    // println!("   Query: {}", query);
+    // println!("   Result: {:?}", result);
+
+    println!("\n=== Example Complete ===");
+    println!("\nNote: This is a template. Actual implementation pending graph API exposure.");
+}