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Optimize grouping query performance

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Shadowghost
2026-03-07 20:14:04 +01:00
parent 077fa89717
commit ea1c1d0468
2 changed files with 6 additions and 3 deletions
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8
Jellyfin.Server.Implementations/Item/BaseItemRepository.QueryBuilding.cs
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@@ -68,19 +68,21 @@ public sealed partial class BaseItemRepository
// for that case the invoker has to run a DistinctBy(e => e.PresentationUniqueKey) on their own
var enableGroupByPresentationUniqueKey = EnableGroupByPresentationUniqueKey(filter);
// Use Min(Id) instead of OrderBy(Id).FirstOrDefault() to avoid EF Core generating
// a correlated scalar subquery per group.
if (enableGroupByPresentationUniqueKey && filter.GroupBySeriesPresentationUniqueKey)
{
var tempQuery = dbQuery.GroupBy(e => new { e.PresentationUniqueKey, e.SeriesPresentationUniqueKey }).Select(e => e.OrderBy(x => x.Id).FirstOrDefault()).Select(e => e!.Id);
var tempQuery = dbQuery.GroupBy(e => new { e.PresentationUniqueKey, e.SeriesPresentationUniqueKey }).Select(e => e.Min(x => x.Id));
dbQuery = context.BaseItems.Where(e => tempQuery.Contains(e.Id));
}
else if (enableGroupByPresentationUniqueKey)
{
var tempQuery = dbQuery.GroupBy(e => e.PresentationUniqueKey).Select(e => e.OrderBy(x => x.Id).FirstOrDefault()).Select(e => e!.Id);
var tempQuery = dbQuery.GroupBy(e => e.PresentationUniqueKey).Select(e => e.Min(x => x.Id));
dbQuery = context.BaseItems.Where(e => tempQuery.Contains(e.Id));
}
else if (filter.GroupBySeriesPresentationUniqueKey)
{
var tempQuery = dbQuery.GroupBy(e => e.SeriesPresentationUniqueKey).Select(e => e.OrderBy(x => x.Id).FirstOrDefault()).Select(e => e!.Id);
var tempQuery = dbQuery.GroupBy(e => e.SeriesPresentationUniqueKey).Select(e => e.Min(x => x.Id));
dbQuery = context.BaseItems.Where(e => tempQuery.Contains(e.Id));
}
else