Initialize CBDD solution and add a .NET-focused gitignore for generated artifacts.

2026-02-20 12:54:07 -05:00
commit b8ed5ec500
214 changed files with 101452 additions and 0 deletions
--- a/tests/CBDD.Tests/BTreeDeleteUnderflowTests.cs
+++ b/tests/CBDD.Tests/BTreeDeleteUnderflowTests.cs
@@ -0,0 +1,55 @@
+using ZB.MOM.WW.CBDD.Core.Indexing;
+using ZB.MOM.WW.CBDD.Core.Storage;
+
+namespace ZB.MOM.WW.CBDD.Tests;
+
+public class BTreeDeleteUnderflowTests
+{
+    [Fact]
+    public void Delete_HeavyWorkload_Should_Remain_Queryable_After_Merges()
+    {
+        var dbPath = Path.Combine(Path.GetTempPath(), $"btree_underflow_{Guid.NewGuid():N}.db");
+
+        try
+        {
+            using var storage = new StorageEngine(dbPath, PageFileConfig.Default);
+            var index = new BTreeIndex(storage, IndexOptions.CreateBTree("k"));
+
+            var insertTxn = storage.BeginTransaction().TransactionId;
+            for (int i = 1; i <= 240; i++)
+            {
+                index.Insert(IndexKey.Create(i), new DocumentLocation((uint)(1000 + i), 0), insertTxn);
+            }
+            storage.CommitTransaction(insertTxn);
+
+            var deleteTxn = storage.BeginTransaction().TransactionId;
+            for (int i = 1; i <= 190; i++)
+            {
+                index.Delete(IndexKey.Create(i), new DocumentLocation((uint)(1000 + i), 0), deleteTxn).ShouldBeTrue();
+            }
+            storage.CommitTransaction(deleteTxn);
+
+            for (int i = 1; i <= 190; i++)
+            {
+                index.TryFind(IndexKey.Create(i), out _, 0).ShouldBeFalse();
+            }
+
+            for (int i = 191; i <= 240; i++)
+            {
+                index.TryFind(IndexKey.Create(i), out var location, 0).ShouldBeTrue();
+                location.PageId.ShouldBe((uint)(1000 + i));
+            }
+
+            var remaining = index.GreaterThan(IndexKey.Create(190), orEqual: false, 0).ToList();
+            remaining.Count.ShouldBe(50);
+            remaining.First().Key.ShouldBe(IndexKey.Create(191));
+            remaining.Last().Key.ShouldBe(IndexKey.Create(240));
+        }
+        finally
+        {
+            if (File.Exists(dbPath)) File.Delete(dbPath);
+            var walPath = Path.ChangeExtension(dbPath, ".wal");
+            if (File.Exists(walPath)) File.Delete(walPath);
+        }
+    }
+}