ignore materialized and alias cols

during instantiation of the batch insert we construct all the columns,
there is no need to do it for materialized and alias columns as they are
non insertable

Author: iyuroch

conn_http_batch.go

@@ -21,13 +21,14 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/ClickHouse/clickhouse-go/v2/lib/column"
-	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
-	"github.com/ClickHouse/clickhouse-go/v2/lib/proto"
 	"io"
 	"io/ioutil"
 	"regexp"
 	"strings"
+
+	"github.com/ClickHouse/clickhouse-go/v2/lib/column"
+	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
+	"github.com/ClickHouse/clickhouse-go/v2/lib/proto"
 )
 
 // \x60 represents a backtick
@@ -63,14 +64,19 @@ func (h *httpConnect) prepareBatch(ctx context.Context, query string, opts drive
 	var colNames []string
 	for r.Next() {
 		var (
-			colName string
-			colType string
-			ignore  string
+			colName      string
+			colType      string
+			default_type string
+			ignore       string
 		)
 
-		if err = r.Scan(&colName, &colType, &ignore, &ignore, &ignore, &ignore, &ignore); err != nil {
+		if err = r.Scan(&colName, &colType, &default_type, &ignore, &ignore, &ignore, &ignore); err != nil {
 			return nil, err
 		}
+		// // these column types cannot be specified in INSERT queries
+		// if default_type == "MATERIALIZED" || default_type == "ALIAS" {
+		// 	continue
+		// }
 		colNames = append(colNames, colName)
 		columns[colName] = colType
 	}