feat: add not_in page skip to canSkipPage

Skips page when min === max and the uniform value appears in the NOT IN
list. Mirrors the neq logic but for multiple exclusion values.

Author: teamchong

src/decode.test.ts

@@ -166,6 +166,20 @@ describe("canSkipPage", () => {
     const bigPage: PageInfo = { byteOffset: 0n, byteLength: 100, rowCount: 50, nullCount: 0, minValue: 10n, maxValue: 90n };
     expect(canSkipPage(bigPage, [{ column: "x", op: "in", value: [1, 5, 95] }], "x")).toBe(true);
   });
+
+  it("skips uniform page where value is in NOT IN list", () => {
+    const uniform: PageInfo = { byteOffset: 0n, byteLength: 100, rowCount: 50, nullCount: 0, minValue: 42, maxValue: 42 };
+    expect(canSkipPage(uniform, [{ column: "x", op: "not_in", value: [10, 42, 99] }], "x")).toBe(true);
+  });
+
+  it("does not skip uniform page where value is not in NOT IN list", () => {
+    const uniform: PageInfo = { byteOffset: 0n, byteLength: 100, rowCount: 50, nullCount: 0, minValue: 42, maxValue: 42 };
+    expect(canSkipPage(uniform, [{ column: "x", op: "not_in", value: [10, 99] }], "x")).toBe(false);
+  });
+
+  it("does not skip range page for NOT IN", () => {
+    expect(canSkipPage(page, [{ column: "x", op: "not_in", value: [10, 50, 90] }], "x")).toBe(false);
+  });
 });
 
 describe("assembleRows", () => {

src/decode.ts

@@ -39,6 +39,17 @@ export function canSkipPage(page: PageInfo, filters: QueryDescriptor["filters"],
         })) return true;
         break;
       }
+      // not_in: skip when entire page is a single value that appears in the NOT IN list
+      case "not_in": {
+        if (!Array.isArray(filter.value) || min !== max) break;
+        if (filter.value.some(v => {
+          let cv = v;
+          if (typeof min === "bigint" && typeof cv === "number") cv = BigInt(Math.trunc(cv));
+          else if (typeof min === "number" && typeof cv === "bigint") cv = Number(cv);
+          return cv === min;
+        })) return true;
+        break;
+      }
       case "between": {
         if (!Array.isArray(filter.value) || filter.value.length !== 2) break;
         let lo = filter.value[0];