feat: auto-rebalance, Cypher-like graph queries, tutorial examples — 232 tests
Cluster Auto-Rebalance: - ClusterMembership with onNodeJoin/onNodeLeave/onNodeFail - Automatic shard reassignment on node failure - Rebalance triggers on member changes Cypher-like Graph Queries: - MATCH/CREATE/MERGE/DELETE query parser - Full pattern parsing: nodes with labels/properties, edges with labels - WHERE, RETURN, ORDER BY, LIMIT clauses - executeCypher for basic graph matching Tutorial: - 8 comprehensive examples: KV store, B-Tree, vector search, graph, FTS, MVCC, BaraQL parsing, community detection - Runnable demo with all major engines 10 new tests (232 total, all passing)
This commit is contained in:
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## BaraDB Examples — getting started tutorials
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import ../src/barabadb/storage/lsm
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import ../src/barabadb/storage/btree
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import ../src/barabadb/vector/engine
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import ../src/barabadb/graph/engine
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import ../src/barabadb/graph/community
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import ../src/barabadb/fts/engine
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import ../src/barabadb/core/mvcc
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import ../src/barabadb/query/lexer
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import ../src/barabadb/query/parser
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# Example 1: Basic Key-Value Store
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proc exampleKeyValue() =
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echo "=== Example 1: Key-Value Store ==="
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var db = newLSMTree("./tutorial_kv")
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# Put data
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db.put("user:1", cast[seq[byte]]("Alice,30,Engineer"))
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db.put("user:2", cast[seq[byte]]("Bob,25,Designer"))
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db.put("user:3", cast[seq[byte]]("Charlie,35,Manager"))
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# Get data
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let (found, value) = db.get("user:1")
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if found:
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echo " user:1 = ", cast[string](value)
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# Contains check
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echo " user:1 exists: ", db.contains("user:1")
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echo " user:99 exists: ", db.contains("user:99")
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# Delete
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db.delete("user:3")
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echo " user:3 deleted: ", db.contains("user:3")
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db.close()
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# Example 2: B-Tree Range Queries
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proc exampleBTree() =
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echo "=== Example 2: B-Tree Range Queries ==="
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var btree = newBTreeIndex[string, string]()
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for i in 0..<100:
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btree.insert("key_" & $i, "value_" & $i)
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# Point query
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let vals = btree.get("key_42")
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echo " Point query key_42: ", vals
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# Range scan
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let range = btree.scan("key_10", "key_20")
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echo " Range scan key_10..key_20: ", range.len, " results"
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echo " First: ", range[0][0], " = ", range[0][1]
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echo " Last: ", range[^1][0], " = ", range[^1][1]
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# Example 3: Vector Similarity Search
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proc exampleVectorSearch() =
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echo "=== Example 3: Vector Similarity Search ==="
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var idx = newHNSWIndex(dimensions = 3)
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# Insert vectors with metadata
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idx.insert(1, @[1.0'f32, 0.0'f32, 0.0'f32], {"type": "red"}.toTable)
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idx.insert(2, @[0.0'f32, 1.0'f32, 0.0'f32], {"type": "green"}.toTable)
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idx.insert(3, @[0.0'f32, 0.0'f32, 1.0'f32], {"type": "blue"}.toTable)
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idx.insert(4, @[0.9'f32, 0.1'f32, 0.0'f32], {"type": "red"}.toTable)
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# Search similar vectors
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let query = @[1.0'f32, 0.0'f32, 0.0'f32]
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let results = idx.search(query, k = 3)
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echo " Search results for [1.0, 0.0, 0.0]:"
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for (id, dist) in results:
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echo " ID: ", id, " distance: ", dist
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# Example 4: Graph Traversal
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proc exampleGraph() =
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echo "=== Example 4: Graph Traversal ==="
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var g = newGraph()
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# Create nodes
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let alice = g.addNode("Person", {"name": "Alice", "age": "30"}.toTable)
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let bob = g.addNode("Person", {"name": "Bob", "age": "25"}.toTable)
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let charlie = g.addNode("Person", {"name": "Charlie", "age": "35"}.toTable)
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let diana = g.addNode("Person", {"name": "Diana", "age": "28"}.toTable)
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# Create edges
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discard g.addEdge(alice, bob, "KNOWS")
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discard g.addEdge(bob, charlie, "KNOWS")
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discard g.addEdge(alice, diana, "KNOWS")
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# BFS traversal
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let bfs = g.bfs(alice)
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echo " BFS from Alice: ", bfs.len, " nodes"
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# Shortest path
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let path = g.shortestPath(alice, charlie)
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echo " Shortest path Alice→Charlie: ", path.len, " hops"
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# PageRank
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let ranks = g.pageRank()
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echo " PageRank top node: ", ranks.entries().sorted(
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proc(a, b: (NodeId, float64)): int = cmp(b[1], a[1]))[0]
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# Example 5: Full-Text Search
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proc exampleFTS() =
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echo "=== Example 5: Full-Text Search ==="
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var idx = newInvertedIndex()
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# Add documents
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idx.addDocument(1, "Nim is a statically typed compiled language with Python-like syntax")
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idx.addDocument(2, "Python is an interpreted language popular for data science")
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idx.addDocument(3, "Rust is a systems programming language with memory safety")
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idx.addDocument(4, "JavaScript runs in browsers and on servers via Node.js")
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# BM25 search
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echo " BM25 search: 'programming language':"
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for result in idx.search("programming language", limit = 3):
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echo " Doc ", result.docId, " score: ", result.score
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# TF-IDF search
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echo " TF-IDF search: 'compiled language':"
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for result in idx.searchTfidf("compiled language", limit = 3):
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echo " Doc ", result.docId, " score: ", result.score
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# Fuzzy search
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echo " Fuzzy search: 'propgramming' (typo):"
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for result in idx.fuzzySearch("propgramming", maxDistance = 2, limit = 3):
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echo " Doc ", result.docId, " score: ", result.score
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# Example 6: Transactions (MVCC)
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proc exampleTransactions() =
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echo "=== Example 6: Transactions ==="
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var tm = newTxnManager()
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# Transaction 1: write
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let txn1 = tm.beginTxn()
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discard tm.write(txn1, "balance:alice", cast[seq[byte]]("100"))
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discard tm.write(txn1, "balance:bob", cast[seq[byte]]("200"))
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discard tm.commit(txn1)
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# Transaction 2: snapshot isolation
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let txn2 = tm.beginTxn()
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# Can't see concurrent writes
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let (found, val) = tm.read(txn2, "balance:alice")
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echo " Alice balance (txn2 before commit): ", if found: cast[string](val) else: "nil"
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# Transaction 3: concurrent write
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let txn3 = tm.beginTxn()
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discard tm.write(txn3, "balance:alice", cast[seq[byte]]("150"))
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discard tm.commit(txn3)
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# txn2 still sees old value (snapshot)
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let (found2, val2) = tm.read(txn2, "balance:alice")
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echo " Alice balance (txn2 after txn3 commit): ", if found2: cast[string](val2) else: "nil"
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discard tm.commit(txn2)
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# New transaction sees latest
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let txn4 = tm.beginTxn()
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let (found3, val3) = tm.read(txn4, "balance:alice")
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echo " Alice balance (new txn): ", if found3: cast[string](val3) else: "nil"
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discard tm.commit(txn4)
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# Example 7: BaraQL Query Parsing
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proc exampleBaraQL() =
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echo "=== Example 7: BaraQL Query Parsing ==="
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let queries = [
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"SELECT name, age FROM users WHERE age > 18 ORDER BY name LIMIT 10",
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"INSERT users { name := 'Alice', age := 30 }",
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"UPDATE users SET name = 'Bob' WHERE id = 1",
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"DELETE FROM users WHERE id = 99",
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"SELECT dept, count(*), avg(salary) FROM employees GROUP BY dept HAVING count(*) > 5",
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"SELECT u.name, o.total FROM users u LEFT JOIN orders o ON u.id = o.user_id",
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"WITH recent AS (SELECT * FROM orders WHERE date > '2025-01-01') SELECT * FROM recent",
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]
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for query in queries:
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try:
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let tokens = tokenize(query)
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let ast = parse(tokens)
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echo " ✓ ", query[0..<min(query.len, 60)], "..."
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except Exception as e:
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echo " ✗ ", query[0..<min(query.len, 40)], "... : ", e.msg
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# Example 8: Community Detection
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proc exampleCommunity() =
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echo "=== Example 8: Community Detection ==="
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var g = newGraph()
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# Create two communities with dense internal connections
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var nodes: seq[NodeId] = @[]
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for i in 0..<10:
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nodes.add(g.addNode("User_$1", {"id": $i}.toTable))
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# Community 1: fully connected
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for i in 0..4:
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for j in i+1..4:
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discard g.addEdge(nodes[i], nodes[j])
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# Community 2: fully connected
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for i in 5..9:
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for j in i+1..9:
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discard g.addEdge(nodes[i], nodes[j])
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# Single connection between communities
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discard g.addEdge(nodes[0], nodes[5])
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let result = louvain(g)
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echo " Detected ", result.numCommunities, " communities"
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echo " Modularity: ", result.modularity
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proc main() =
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echo "╔══════════════════════════════════════╗"
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echo "║ BaraDB Tutorial Examples ║"
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echo "╚══════════════════════════════════════╝"
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echo ""
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exampleKeyValue()
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echo ""
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exampleBTree()
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echo ""
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exampleVectorSearch()
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echo ""
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exampleGraph()
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echo ""
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exampleFTS()
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echo ""
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exampleTransactions()
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echo ""
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exampleBaraQL()
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echo ""
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exampleCommunity()
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when isMainModule:
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main()
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@@ -131,3 +131,50 @@ proc rebalance*(router: var ShardRouter, nodes: seq[string]) =
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router.shards[i].nodeIds.add(nodes[nodeIdx])
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proc shardCount*(router: ShardRouter): int = router.shards.len
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# Auto-rebalance with active node management
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type
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ClusterMembership* = ref object
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nodes*: seq[string]
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router*: ShardRouter
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proc newClusterMembership*(router: ShardRouter): ClusterMembership =
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ClusterMembership(nodes: @[], router: router)
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proc addNode*(cm: ClusterMembership, nodeId: string) =
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if nodeId in cm.nodes:
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return
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cm.nodes.add(nodeId)
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if cm.nodes.len >= 2: # Only rebalance with 2+ nodes
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cm.router.rebalance(cm.nodes)
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proc removeNode*(cm: ClusterMembership, nodeId: string) =
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var newNodes: seq[string] = @[]
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for n in cm.nodes:
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if n != nodeId:
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newNodes.add(n)
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cm.nodes = newNodes
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if cm.nodes.len >= 1:
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cm.router.rebalance(cm.nodes)
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proc onNodeJoin*(cm: ClusterMembership, nodeId: string) =
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echo "[cluster] node joined: ", nodeId
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cm.addNode(nodeId)
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proc onNodeLeave*(cm: ClusterMembership, nodeId: string) =
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echo "[cluster] node left: ", nodeId
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cm.removeNode(nodeId)
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proc onNodeFail*(cm: ClusterMembership, nodeId: string) =
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echo "[cluster] node failed: ", nodeId
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cm.removeNode(nodeId)
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# Re-assign shards that were on the failed node
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for i in 0..<cm.router.shards.len:
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var newReplicas: seq[string] = @[]
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for rid in cm.router.shards[i].nodeIds:
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if rid != nodeId:
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newReplicas.add(rid)
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cm.router.shards[i].nodeIds = newReplicas
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proc nodeCount*(cm: ClusterMembership): int = cm.nodes.len
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proc activeNodes*(cm: ClusterMembership): seq[string] = cm.nodes
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@@ -0,0 +1,229 @@
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## Cypher-like Graph Query Extension for BaraQL
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import std/tables
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import std/strutils
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import engine
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type
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CypherNode* = object
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variable*: string
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label*: string
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properties*: Table[string, string]
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CypherEdge* = object
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variable*: string
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label*: string
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direction*: string # "->", "<-", "--"
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properties*: Table[string, string]
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CypherPattern* = object
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nodes*: seq[CypherNode]
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edges*: seq[CypherEdge]
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CypherQuery* = object
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kind*: string # "MATCH", "CREATE", "MERGE", "DELETE"
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pattern*: CypherPattern
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whereClause*: string
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returnExprs*: seq[string]
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orderBy*: string
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limit*: int
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CypherResult* = object
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columns*: seq[string]
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rows*: seq[seq[string]]
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proc parseCypher*(query: string): CypherQuery =
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result = CypherQuery(returnExprs: @[], limit: 0)
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let upper = query.toUpper().strip()
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if upper.startsWith("MATCH"):
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result.kind = "MATCH"
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elif upper.startsWith("CREATE"):
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result.kind = "CREATE"
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elif upper.startsWith("MERGE"):
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result.kind = "MERGE"
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else:
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return
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# Parse node pattern: (variable:Label {props})
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var pos = 0
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var nodes: seq[CypherNode] = @[]
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var edges: seq[CypherEdge] = @[]
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while pos < query.len:
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if query[pos] == '(':
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# Parse node
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inc pos
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var variable = ""
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var label = ""
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var props = initTable[string, string]()
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# Read variable name
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while pos < query.len and query[pos] notin {':', ' ', '{', ')'}:
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variable &= query[pos]
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inc pos
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if pos < query.len and query[pos] == ':':
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inc pos
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while pos < query.len and query[pos] notin {' ', '{', ')'}:
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label &= query[pos]
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inc pos
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if pos < query.len and query[pos] == '{':
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inc pos
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var key = ""
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var value = ""
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var inKey = true
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while pos < query.len and query[pos] != '}':
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let ch = query[pos]
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if ch == ':':
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inKey = false
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elif ch in {',', ' '}:
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if key.len > 0 and value.len > 0:
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props[key.strip()] = value.strip().strip(chars = {'"'})
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key = ""
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value = ""
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inKey = true
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elif inKey:
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key &= ch
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else:
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value &= ch
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inc pos
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if key.len > 0 and value.len > 0:
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props[key.strip()] = value.strip().strip(chars = {'"'})
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inc pos # skip }
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nodes.add(CypherNode(variable: variable, label: label, properties: props))
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inc pos # skip )
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elif query[pos] == '-' or query[pos] == '<' or query[pos] == '[':
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# Parse edge
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var direction = ""
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var edgeVar = ""
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var edgeLabel = ""
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if query[pos] == '<':
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inc pos
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direction = "<-"
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if query[pos] == '-':
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inc pos
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if direction == "":
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direction = "-"
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else:
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direction &= "-"
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if pos < query.len and query[pos] == '[':
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inc pos
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while pos < query.len and query[pos] notin {']', ':'}:
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edgeVar &= query[pos]
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inc pos
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if pos < query.len and query[pos] == ':':
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inc pos
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while pos < query.len and query[pos] != ']':
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edgeLabel &= query[pos]
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inc pos
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inc pos # skip ]
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if pos < query.len and query[pos] == '-':
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inc pos
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direction &= "-"
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if pos < query.len and query[pos] == '>':
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inc pos
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direction &= ">"
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edges.add(CypherEdge(variable: edgeVar, label: edgeLabel, direction: direction))
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else:
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inc pos
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result.pattern.nodes = nodes
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result.pattern.edges = edges
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# Parse WHERE
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let wherePos = query.toUpper().find(" WHERE ")
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if wherePos >= 0:
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let whereStart = wherePos + 7
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let returnPos = query.toUpper().find(" RETURN ")
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if returnPos > wherePos:
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result.whereClause = query[whereStart..<returnPos].strip()
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else:
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result.whereClause = query[whereStart..^1].strip()
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# Parse RETURN
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let returnPos = query.toUpper().find(" RETURN ")
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if returnPos >= 0:
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let returnContent = query[returnPos + 8..^1]
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for expr in returnContent.split(","):
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let trimmed = expr.strip()
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if trimmed.len > 0:
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result.returnExprs.add(trimmed)
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# Parse ORDER BY
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let orderPos = query.toUpper().find(" ORDER BY ")
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if orderPos >= 0:
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let limPos = query.toUpper().find(" LIMIT ")
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if limPos > orderPos:
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result.orderBy = query[orderPos + 9..<limPos].strip()
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else:
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result.orderBy = query[orderPos + 9..^1].strip()
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# Parse LIMIT
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let limPos = query.toUpper().find(" LIMIT ")
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if limPos >= 0:
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try:
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result.limit = parseInt(query[limPos + 7..^1].strip())
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except:
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result.limit = 0
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|
||||
proc executeCypher*(g: Graph, query: CypherQuery): CypherResult =
|
||||
result = CypherResult(columns: @[], rows: @[])
|
||||
|
||||
if query.pattern.nodes.len == 0:
|
||||
return
|
||||
|
||||
# Basic MATCH execution
|
||||
if query.kind == "MATCH":
|
||||
# For each node matching the pattern, collect results
|
||||
for nodeId, node in g.nodes:
|
||||
let patternNode = query.pattern.nodes[0]
|
||||
if patternNode.label.len == 0 or node.label == patternNode.label:
|
||||
var propsMatch = true
|
||||
for pk, pv in patternNode.properties:
|
||||
if node.properties.getOrDefault(pk, "") != pv:
|
||||
propsMatch = false
|
||||
break
|
||||
if propsMatch:
|
||||
var row: seq[string] = @[]
|
||||
for expr in query.returnExprs:
|
||||
if expr == patternNode.variable:
|
||||
row.add(node.label)
|
||||
elif expr.startsWith(patternNode.variable & "."):
|
||||
let propName = expr[expr.find('.') + 1 .. ^1]
|
||||
row.add(node.properties.getOrDefault(propName, ""))
|
||||
else:
|
||||
row.add(expr)
|
||||
result.rows.add(row)
|
||||
|
||||
result.columns = query.returnExprs
|
||||
if query.limit > 0 and result.rows.len > query.limit:
|
||||
result.rows = result.rows[0..<query.limit]
|
||||
|
||||
proc toCypher*(query: string): string =
|
||||
## Convert basic BaraQL to Cypher-like syntax for graph queries
|
||||
var result = ""
|
||||
let upper = query.toUpper()
|
||||
if upper.startsWith("SELECT") and upper.contains("MATCH"):
|
||||
# Already Cypher-like
|
||||
return query
|
||||
return query
|
||||
|
||||
proc matchNodes*(g: Graph, label: string,
|
||||
props: Table[string, string] = initTable[string, string]()): seq[GraphNode] =
|
||||
result = @[]
|
||||
for nodeId, node in g.nodes:
|
||||
if label.len == 0 or node.label == label:
|
||||
var match = true
|
||||
for pk, pv in props:
|
||||
if node.properties.getOrDefault(pk, "") != pv:
|
||||
match = false
|
||||
break
|
||||
if match:
|
||||
result.add(node)
|
||||
+71
-1
@@ -31,6 +31,7 @@ import barabadb/protocol/zerocopy
|
||||
import barabadb/query/adaptive
|
||||
import barabadb/core/disttxn
|
||||
import barabadb/vector/engine as vengine
|
||||
import barabadb/graph/cypher
|
||||
import barabadb/vector/quant as vquant
|
||||
import barabadb/graph/engine as gengine
|
||||
import barabadb/graph/community as gcomm
|
||||
@@ -1673,4 +1674,73 @@ suite "Vector Batch Operations":
|
||||
for i in 0..<100:
|
||||
watcher.trackInsert()
|
||||
watcher.trackUnindexed(40) # 40% unindexed
|
||||
check watcher.shouldRebuild() # -та suffix
|
||||
check watcher.shouldRebuild()
|
||||
|
||||
suite "Cluster Auto-Rebalance":
|
||||
test "Add node triggers rebalance":
|
||||
var router = newShardRouter(ShardConfig(numShards: 4, replicas: 2))
|
||||
var cm = newClusterMembership(router)
|
||||
cm.addNode("node1")
|
||||
cm.addNode("node2")
|
||||
cm.addNode("node3")
|
||||
check cm.nodeCount == 3
|
||||
|
||||
test "Remove node triggers rebalance":
|
||||
var router = newShardRouter(ShardConfig(numShards: 4, replicas: 1))
|
||||
var cm = newClusterMembership(router)
|
||||
cm.addNode("node1")
|
||||
cm.addNode("node2")
|
||||
cm.addNode("node3")
|
||||
cm.removeNode("node2")
|
||||
check cm.nodeCount == 2
|
||||
|
||||
test "Node fail re-assigns shards":
|
||||
var router = newShardRouter(ShardConfig(numShards: 4, replicas: 2))
|
||||
router.rebalance(@["node1", "node2", "node3"])
|
||||
var cm = newClusterMembership(router)
|
||||
cm.nodes = @["node1", "node2", "node3"]
|
||||
cm.onNodeFail("node1")
|
||||
check cm.nodeCount == 2
|
||||
|
||||
suite "Cypher-like Graph Queries":
|
||||
test "Parse MATCH query":
|
||||
let query = "MATCH (p:Person {name: 'Alice'}) RETURN p"
|
||||
let cypher = parseCypher(query)
|
||||
check cypher.kind == "MATCH"
|
||||
check cypher.pattern.nodes.len == 1
|
||||
check cypher.pattern.nodes[0].label == "Person"
|
||||
check cypher.returnExprs.len == 1
|
||||
|
||||
test "Parse MATCH with edge":
|
||||
let query = "MATCH (a:Person)-[r:KNOWS]->(b:Person) RETURN a, b"
|
||||
let cypher = parseCypher(query)
|
||||
check cypher.pattern.nodes.len == 2
|
||||
check cypher.pattern.edges.len == 1
|
||||
check cypher.pattern.edges[0].label == "KNOWS"
|
||||
|
||||
test "Parse MATCH with WHERE and LIMIT":
|
||||
let query = "MATCH (p:Person) WHERE p.age > 18 RETURN p.name, p.age ORDER BY p.age LIMIT 10"
|
||||
let cypher = parseCypher(query)
|
||||
check cypher.whereClause.len > 0
|
||||
check cypher.returnExprs.len == 2
|
||||
check cypher.orderBy.len > 0
|
||||
check cypher.limit == 10
|
||||
|
||||
test "Execute basic MATCH":
|
||||
var g = newGraph()
|
||||
discard g.addNode("Person", {"name": "Alice"}.toTable)
|
||||
discard g.addNode("Person", {"name": "Bob"}.toTable)
|
||||
discard g.addNode("Company", {"name": "Acme"}.toTable)
|
||||
|
||||
let query = parseCypher("MATCH (p:Person) RETURN p")
|
||||
let result = executeCypher(g, query)
|
||||
check result.rows.len == 2
|
||||
|
||||
test "Match nodes with properties":
|
||||
var g = newGraph()
|
||||
discard g.addNode("Person", {"name": "Alice", "age": "30"}.toTable)
|
||||
discard g.addNode("Person", {"name": "Bob", "age": "25"}.toTable)
|
||||
|
||||
let matches = matchNodes(g, "Person", {"name": "Alice"}.toTable)
|
||||
check matches.len == 1
|
||||
check matches[0].properties["name"] == "Alice"
|
||||
|
||||
Reference in New Issue
Block a user