rename MaxDepth to Depth

bucket.go

@@ -350,8 +350,8 @@ func (b *Bucket) Stat() *BucketStat {
 			s.BranchOverflowN += int(p.overflow)
 		}
 
-		if depth+1 > s.MaxDepth {
-			s.MaxDepth = (depth + 1)
+		if depth+1 > s.Depth {
+			s.Depth = (depth + 1)
 		}
 	})
 	s.BranchAlloc = (s.BranchPageN + s.BranchOverflowN) * pageSize
@@ -522,7 +522,7 @@ type BucketStat struct {
 	LeafPageN       int
 	LeafOverflowN   int
 	KeyN            int
-	MaxDepth        int
+	Depth           int
 	BranchAlloc     int
 	BranchInuse     int
 	LeafAlloc       int

bucket_test.go

@@ -496,7 +496,7 @@ func TestBucket_Stat(t *testing.T) {
 			assert.Equal(t, stat.LeafPageN, 6)
 			assert.Equal(t, stat.LeafOverflowN, 2)
 			assert.Equal(t, stat.KeyN, 501)
-			assert.Equal(t, stat.MaxDepth, 2)
+			assert.Equal(t, stat.Depth, 2)
 			if os.Getpagesize() != 4096 {
 				// Incompatible page size
 				assert.Equal(t, stat.BranchInuse, 125)
@@ -530,7 +530,7 @@ func TestBucket_Stat_Small(t *testing.T) {
 			assert.Equal(t, stat.LeafPageN, 1)
 			assert.Equal(t, stat.LeafOverflowN, 0)
 			assert.Equal(t, stat.KeyN, 1)
-			assert.Equal(t, stat.MaxDepth, 1)
+			assert.Equal(t, stat.Depth, 1)
 			if os.Getpagesize() != 4096 {
 				// Incompatible page size
 				assert.Equal(t, stat.BranchInuse, 0)
@@ -568,7 +568,7 @@ func TestBucket_Stat_Large(t *testing.T) {
 			assert.Equal(t, stat.LeafPageN, 1281)
 			assert.Equal(t, stat.LeafOverflowN, 0)
 			assert.Equal(t, stat.KeyN, 100000)
-			assert.Equal(t, stat.MaxDepth, 3)
+			assert.Equal(t, stat.Depth, 3)
 			if os.Getpagesize() != 4096 {
 				// Incompatible page size
 				assert.Equal(t, stat.BranchInuse, 27289)