Code optimization

Src/Asp.Net/SqlServerTest/UnitTest/UQueryable2.cs

@@ -1,4 +1,5 @@
-using System;
+using SqlSugar;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -32,6 +33,51 @@ namespace OrmTest
                .Where(it => it.Items.Any())
                .ToList();
 
+
+            var sql=Db.Queryable<Order>().AS("[order]").ToList();
+
+            var sql1 = Db.Queryable<Order, OrderItem, Custom>((o, i, c) => new JoinQueryInfos(
+             JoinType.Left, o.Id == i.OrderId,
+             JoinType.Left, c.Id == o.CustomId
+            ))
+            .AS("[aa]")
+            .AS<OrderItem>("[xx]")
+            .AS<Custom>("[yy]")
+           .Select<ViewOrder>().ToSql().Key;
+            if (!sql1.Contains("[aa]") || !sql1.Contains("[xx]") || !sql1.Contains("[yy]"))
+            {
+                throw new Exception("unit queryable2 ");
+            }
+            var sql2 = Db.Queryable<OrderItem>().AS("[zz]").ToSql().Key;
+            if (sql2 != "SELECT [ItemId],[OrderId],[Price],[CreateTime] FROM [zz] ")
+            {
+                throw new Exception("unit queryable2 ");
+            }
+            Db.Queryable<Order, OrderItem, Custom>((o, i, c) => new JoinQueryInfos(
+             JoinType.Left, o.Id == i.OrderId,
+             JoinType.Left, c.Id == o.CustomId
+            ))
+            .AS("[order]")
+            .AS<OrderItem>("[orderdetail]")
+            .AS<Custom>("[custom]")
+           .Select<ViewOrder>().ToList();
+
+            Db.Queryable<object>().AS("[order]").Select("*").ToList();
+
+            var qu1=Db.Queryable<Order>().Select(it => new
+            {
+                id = it.Id
+            }).MergeTable().Select<Order>();
+            var qu2 = Db.Queryable<Order>().Select(it => new
+            {
+                id = it.Id,
+                name=it.Name
+            }).MergeTable().Select<Order>();
+            var list=Db.Queryable(qu1, qu2,JoinType.Left, (x, y) => x.Id == y.Id).Select((x,y) => new
+            {
+                id1=x.Id,
+                name=y.Name
+            }).ToList();
         }
     }
 }

Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs

@@ -358,10 +358,19 @@ namespace SqlSugar
 
         public virtual string ToJoinString(JoinQueryInfo joinInfo)
         {
+            var name = joinInfo.TableName;
+            if (this.AsTables.Any(it => it.Key == name))
+            {
+                if (this.Context.MappingTables != null && this.Context.MappingTables.Any(it => it.DbTableName == name))
+                {
+                    name = this.Context.MappingTables.First(it => it.DbTableName == name).EntityName;
+                }
+                name = this.AsTables.First(it => it.Key == name).Value;
+            }
             return string.Format(
                 this.JoinTemplate,
                 joinInfo.JoinType.ToString() + UtilConstants.Space,
-                Builder.GetTranslationTableName(joinInfo.TableName) + UtilConstants.Space,
+                Builder.GetTranslationTableName(name) + UtilConstants.Space,
                 joinInfo.ShortName + UtilConstants.Space + (TableWithString == SqlWith.Null ? " " : TableWithString),
                 joinInfo.JoinWhere);
         }