Move QueryableExtensions to System.Linq namespace.

src/AbpDesk/AbpDesk.Application/AbpDesk/Tickets/TicketAppService.cs

@@ -7,7 +7,6 @@ using Volo.Abp.Application.Services;
 using Volo.Abp.Application.Services.Dtos;
 using Volo.Abp.Domain.Repositories;
 using Volo.Abp.Linq;
-using Volo.Abp.Linq.Extensions;
 
 namespace AbpDesk.Tickets
 {

src/Volo.Abp/Volo/Abp/Linq/Extensions/QueryableExtensions.cs → src/Volo.Abp/System/Linq/AbpQueryableExtensions.cs

@@ -1,15 +1,14 @@
-using System;
+using System.Linq.Expressions;
-using System.Linq;
-using System.Linq.Expressions;
 using JetBrains.Annotations;
+using Volo.Abp;
 using Volo.Abp.Application.Services.Dtos;
 
-namespace Volo.Abp.Linq.Extensions
+namespace System.Linq
 {
     /// <summary>
     /// Some useful extension methods for <see cref="IQueryable{T}"/>.
     /// </summary>
-    public static class QueryableExtensions
+    public static class AbpQueryableExtensions
     {
         /// <summary>
         /// Used for paging. Can be used as an alternative to Skip(...).Take(...) chaining.

src/Volo.Abp/Volo/Abp/Application/Services/CrudAppServiceBase.cs

@@ -6,7 +6,6 @@ using Volo.Abp.Application.Services;
 using Volo.Abp.Application.Services.Dtos;
 using Volo.Abp.Domain.Entities;
 using Volo.Abp.Domain.Repositories;
-using Volo.Abp.Linq.Extensions;
 
 namespace Abp.Application.Services
 {