Fix Set Uninitialized

column_test.go

@@ -325,10 +325,10 @@ func TestForString(t *testing.T) {
 	})
 
 	data := []string{"a", "b", "c", "d"}
-
 	for i, d := range data {
 		coll.Insert(map[string]interface{}{"id": i, "data": d})
 	}
+
 	coll.Query(func(tx *Txn) error {
 		tx.With("one").Select(func(v Selector) {
 			assert.Equal(t, "b", v.StringAt("data"))

txn.go

@@ -397,6 +397,11 @@ func (txn *Txn) commit() {
 		})
 	}
 
+	// Set upper bound to max(inserts, fill)
+	if m := uint32(len(txn.index) << 6); m > max {
+		max = m
+	}
+
 	// Commit chunk by chunk to reduce lock contentions
 	var typ commit.Type
 	txn.rangeWrite(func(chunk uint32, fill bitmap.Bitmap) {

txn_test.go

@@ -417,3 +417,36 @@ func TestCountTwice(t *testing.T) {
 		return nil
 	})
 }
+
+// Details: https://github.com/kelindar/column/issues/15
+func TestUninitializedSet(t *testing.T) {
+	c := NewCollection()
+	c.CreateColumn("col1", ForString())
+	c.CreateColumn("col2", ForFloat64())
+	c.CreateColumn("col3", ForString())
+	someMap := map[string][]interface{}{
+		"1": {"A", 1.0},
+		"2": {"B", 2.0},
+	}
+
+	assert.NoError(t, c.Query(func(txn *Txn) error {
+		for i := 0; i < 20000; i++ {
+			txn.Insert(map[string]interface{}{
+				"col1": fmt.Sprint(i % 3),
+			})
+		}
+		return nil
+	}))
+
+	assert.NoError(t, c.Query(func(txn *Txn) error {
+		assert.NoError(t, txn.Range("col2", func(v Cursor) {
+			v.SetFloat64(0)
+		}))
+		return txn.Range("col1", func(v Cursor) {
+			if a, h := someMap[v.String()]; h {
+				v.SetFloat64At("col2", a[1].(float64))
+				v.SetStringAt("col3", a[0].(string))
+			}
+		})
+	}))
+}