Fix zero/nil values for net.IP (#1118)

lib/column/ipv4.go

@@ -242,7 +242,12 @@ func (col *IPv4) AppendRow(v any) (err error) {
 			col.col.Append(0)
 		}
 	case net.IP:
-		col.col.Append(proto.ToIPv4(netIPToNetIPAddr(v)))
+		switch {
+		case len(v) == 0:
+			col.col.Append(0)
+		default:
+			col.col.Append(proto.ToIPv4(netIPToNetIPAddr(v)))
+		}
 	case *net.IP:
 		switch {
 		case v != nil:

lib/column/ipv6.go

@@ -333,6 +333,10 @@ func (col *IPv6) Encode(buffer *proto.Buffer) {
 }
 
 func IPv6ToBytes(ip net.IP) [16]byte {
+	if ip == nil {
+		return [16]byte{}
+	}
+
 	if len(ip) == 4 {
 		ip = ip.To16()
 	}

tests/issues/1106_test.go

@@ -0,0 +1,38 @@
+package issues
+
+import (
+	"context"
+	"net"
+	"testing"
+
+	"github.com/ClickHouse/clickhouse-go/v2"
+	clickhouse_tests "github.com/ClickHouse/clickhouse-go/v2/tests"
+	"github.com/stretchr/testify/require"
+)
+
+func Test1106(t *testing.T) {
+	var (
+		conn, err = clickhouse_tests.GetConnection("issues", clickhouse.Settings{
+			"max_execution_time":             60,
+			"allow_experimental_object_type": true,
+		}, nil, &clickhouse.Compression{
+			Method: clickhouse.CompressionLZ4,
+		})
+	)
+	ctx := context.Background()
+	require.NoError(t, err)
+	const ddl = "CREATE TABLE test_1106 (col1 IPv6, col2 IPv6, col3 IPv4, col4 IPv4) Engine MergeTree() ORDER BY tuple()"
+	require.NoError(t, conn.Exec(ctx, ddl))
+	defer func() {
+		conn.Exec(ctx, "DROP TABLE IF EXISTS test_1106")
+	}()
+
+	batch, err := conn.PrepareBatch(context.Background(), "INSERT INTO test_1106")
+	require.NoError(t, err)
+
+	var ip net.IP
+	var ipPtr *net.IP
+
+	require.NoError(t, batch.Append(ip, ipPtr, ip, ipPtr))
+	require.NoError(t, batch.Send())
+}