Merge pull request go-gorm#13 from mihaitodor/add-json-marshal-support

Add support for marshalling complex types to JSON

driver/columns.go

@@ -1,8 +1,10 @@
 package driver
 
 import (
-	"cloud.google.com/go/bigquery"
 	"database/sql/driver"
+	"encoding/json"
+
+	"cloud.google.com/go/bigquery"
 	"gorm.io/driver/bigquery/adaptor"
 )
 
@@ -34,6 +36,10 @@ type bigQueryReroutedColumn struct {
 	schema bigquery.Schema
 }
 
+func (c bigQueryReroutedColumn) MarshalJSON() ([]byte, error) {
+	return json.Marshal(c.values)
+}
+
 type bigQueryColumn struct {
 	Name    string
 	Schema  bigquery.Schema