fix(knowledge): Fix the issue where knowledge cannot execute aggregated SQL (#794)

backend/infra/contract/document/nl2sql/nl2sql.go

@@ -24,6 +24,7 @@ import (
 	"github.com/coze-dev/coze-studio/backend/infra/contract/document"
 )
 
+//go:generate  mockgen -destination ../../../internal/mock/infra/contract/nl2sql_mock/nl2sql_mock.go -package mock -source nl2sql.go Factory
 type NL2SQL interface {
 	NL2SQL(ctx context.Context, messages []*schema.Message, tables []*document.TableSchema, opts ...Option) (sql string, err error)
 }

backend/infra/contract/sqlparser/sql_parser.go

@@ -74,4 +74,7 @@ type SQLParser interface {
 
 	// AppendSQLFilter appends a filter condition to the SQL statement.
 	AppendSQLFilter(sql string, op SQLFilterOp, filter string) (string, error)
+
+	// AddSelectFieldsToSelectSQL add select fields to select sql
+	AddSelectFieldsToSelectSQL(origSQL string, cols []string) (string, error)
 }