fix(ts-oss/cassandra): apply every operator in a compound field filter (#6511)

mem0-ts/src/oss/tests/cassandra.unit.test.ts

@@ -0,0 +1,63 @@
+/// <reference types="jest" />
+/**
+ * Cassandra vector store — filter matching unit tests.
+ *
+ * Cassandra has no server-side metadata filter, so search()/list() scan rows
+ * and apply filters in-app via matchFieldCondition(). These tests drive that
+ * matcher through the public list() API with an injected fake client.
+ */
+import { CassandraDB } from "../src/vector_stores/cassandra";
+
+type Row = { id: string; payload: Record<string, any> };
+
+// Minimal fake driver: CREATE statements during initialize() return nothing;
+// a SELECT returns the seeded rows in one page (pageState undefined => stop).
+function fakeClient(rows: Row[]) {
+  return {
+    async connect() {},
+    async execute(query: string) {
+      if (/^\s*SELECT/i.test(query)) {
+        return { rows, pageState: undefined };
+      }
+      return { rows: [], pageState: undefined };
+    },
+    async shutdown() {},
+  };
+}
+
+function makeStore(rows: Row[]) {
+  return new CassandraDB({
+    keyspace: "mem0",
+    collectionName: "mem0",
+    dimension: 3,
+    client: fakeClient(rows) as any,
+  } as any);
+}
+
+describe("CassandraDB filter matching", () => {
+  const rows: Row[] = [
+    { id: "a", payload: { data: "a", age: 5 } },
+    { id: "b", payload: { data: "b", age: 15 } },
+    { id: "c", payload: { data: "c", age: 25 } },
+  ];
+
+  it("applies every operator in a compound range filter (not just the first)", async () => {
+    const store = makeStore(rows);
+    // age in [10, 20]: only "b" (15) qualifies. The old matcher returned on the
+    // first operator (gte), so "c" (25) leaked through because lte was ignored.
+    const [results] = await store.list({ age: { gte: 10, lte: 20 } });
+    expect(results.map((r) => r.id)).toEqual(["b"]);
+  });
+
+  it("still matches a single-operator filter", async () => {
+    const store = makeStore(rows);
+    const [results] = await store.list({ age: { gte: 15 } });
+    expect(results.map((r) => r.id).sort()).toEqual(["b", "c"]);
+  });
+
+  it("treats a plain equality filter as before", async () => {
+    const store = makeStore(rows);
+    const [results] = await store.list({ age: 15 });
+    expect(results.map((r) => r.id)).toEqual(["b"]);
+  });
+});