取消笛卡尔积运算

src/Jiaowu.Api/Infrastructure/Exams/ExamArrangementService.cs

@@ -55,6 +55,7 @@ public sealed class ExamArrangementService(AppDbContext db)
                 .ThenInclude(x => x.Seats)
             .Include(x => x.Rooms)
                 .ThenInclude(x => x.Invigilators)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(x => x.Id == planId, cancellationToken);
 
         if (plan is null)

src/Jiaowu.Api/Infrastructure/Exams/ExamSignInExportJobProcessor.cs

@@ -60,6 +60,7 @@ public sealed class ExamSignInExportJobProcessor(
                 .ThenBy(x => x.StartPeriod)
                 .ThenBy(x => x.Classroom!.Building!.Name)
                 .ThenBy(x => x.Classroom!.Name)
+                .AsSplitQuery()
                 .ToListAsync(stoppingToken);
 
             var legacySessions = await db.ExamSessions.AsNoTracking()

src/Jiaowu.Api/Infrastructure/Exams/MakeupExamArrangementService.cs

@@ -29,6 +29,7 @@ public sealed class MakeupExamArrangementService(AppDbContext db)
             .Include(x => x.Sessions)
                 .ThenInclude(x => x.TeachingTask)
                     .ThenInclude(x => x!.Course)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(x => x.Id == planId, cancellationToken);
 
         if (plan is null)