feat: add uint64 surport

.gitignore

@@ -1,2 +1,3 @@
 .git
 *.swp
+.idea/

decimal.go

@@ -87,6 +87,14 @@ func New(value int64, exp int32) Decimal {
 	}
 }
 
+// NewFromUint64 returns a new Decimal from a uint64, value * 10 ^ exp
+func NewFromUint64(value uint64, exp int32) Decimal {
+	return Decimal{
+		value: new(big.Int).SetUint64(value),
+		exp:   exp,
+	}
+}
+
 // NewFromBigInt returns a new Decimal from a big.Int, value * 10 ^ exp
 func NewFromBigInt(value *big.Int, exp int32) Decimal {
 	return Decimal{
@@ -988,6 +996,12 @@ func (d *Decimal) Scan(value interface{}) error {
 		*d = New(v, 0)
 		return nil
 
+	case uint64:
+		// at least in clickhouse when the value is 0 in db, the data is sent
+		// to us as an uint64 instead of a int64 ...
+		*d = NewFromUint64(v, 0)
+		return nil
+
 	default:
 		// default is trying to interpret value stored as string
 		str, err := unquoteIfQuoted(v)