From 7fc2459df982dd1aa87a655d59aa5dd5ff49820a Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Wed, 4 Aug 2021 22:04:49 +0800
Subject: [PATCH] drop duplicated feature

---
 dialects/dialect.go | 3 +--
 engine.go           | 2 +-
 session_schema.go   | 5 +++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/dialects/dialect.go b/dialects/dialect.go
index f5b04368..396727ce 100644
--- a/dialects/dialect.go
+++ b/dialects/dialect.go
@@ -44,8 +44,7 @@ const (
 )
 
 type DialectFeatures struct {
-	AutoincrMode    int // 0 autoincrement column, 1 sequence
-	SupportSequence bool
+	AutoincrMode int // 0 autoincrement column, 1 sequence
 }
 
 // Dialect represents a kind of database
diff --git a/engine.go b/engine.go
index b7c45563..f868e23a 100644
--- a/engine.go
+++ b/engine.go
@@ -513,7 +513,7 @@ func (engine *Engine) dumpTables(ctx context.Context, tables []*schemas.Table, w
 			return err
 		}
 
-		if dstTable.AutoIncrement != "" && dstDialect.Features().SupportSequence {
+		if dstTable.AutoIncrement != "" && dstDialect.Features().AutoincrMode == dialects.SequenceAutoincrMode {
 			sqlstr, err = dstDialect.CreateSequenceSQL(ctx, engine.db, utils.SeqName(dstTableName))
 			if err != nil {
 				return err
diff --git a/session_schema.go b/session_schema.go
index ba622b82..52ffcf8e 100644
--- a/session_schema.go
+++ b/session_schema.go
@@ -13,6 +13,7 @@ import (
 	"os"
 	"strings"
 
+	"xorm.io/xorm/dialects"
 	"xorm.io/xorm/internal/utils"
 	"xorm.io/xorm/schemas"
 )
@@ -53,7 +54,7 @@ func (session *Session) createTable(bean interface{}) error {
 		return err
 	}
 
-	if refTable.AutoIncrement != "" && session.engine.dialect.Features().SupportSequence {
+	if refTable.AutoIncrement != "" && session.engine.dialect.Features().AutoincrMode == dialects.SequenceAutoincrMode {
 		sqlStr, err = session.engine.dialect.CreateSequenceSQL(context.Background(), session.engine.db, utils.SeqName(tableName))
 		if err != nil {
 			return err
@@ -164,7 +165,7 @@ func (session *Session) dropTable(beanOrTableName interface{}) error {
 		return err
 	}
 
-	if !session.engine.dialect.Features().SupportSequence {
+	if session.engine.dialect.Features().AutoincrMode == dialects.IncrAutoincrMode {
 		return nil
 	}