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Optimize Search and NextUp queries

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Shadowghost
2026-03-08 15:10:01 +01:00
parent 1d8bdcc411
commit ba722b4517
10 changed files with 1921 additions and 75 deletions
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18
Jellyfin.Server.Implementations/Item/BaseItemRepository.QueryBuilding.cs
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@@ -68,22 +68,24 @@ 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.
// Materialize GroupBy IDs first to split the complex expression tree.
// This runs the filter+GroupBy+Min as one simple SQL query, then the downstream
// Order/Paging/Navigations work on a flat WHERE Id IN (...) list, avoiding
// EF Core having to compile a deeply nested expression tree.
if (enableGroupByPresentationUniqueKey && filter.GroupBySeriesPresentationUniqueKey)
{
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));
var groupedIds = dbQuery.GroupBy(e => new { e.PresentationUniqueKey, e.SeriesPresentationUniqueKey }).Select(e => e.Min(x => x.Id)).ToList();
dbQuery = context.BaseItems.Where(e => groupedIds.Contains(e.Id));
}
else if (enableGroupByPresentationUniqueKey)
{
var tempQuery = dbQuery.GroupBy(e => e.PresentationUniqueKey).Select(e => e.Min(x => x.Id));
dbQuery = context.BaseItems.Where(e => tempQuery.Contains(e.Id));
var groupedIds = dbQuery.GroupBy(e => e.PresentationUniqueKey).Select(e => e.Min(x => x.Id)).ToList();
dbQuery = context.BaseItems.Where(e => groupedIds.Contains(e.Id));
}
else if (filter.GroupBySeriesPresentationUniqueKey)
{
var tempQuery = dbQuery.GroupBy(e => e.SeriesPresentationUniqueKey).Select(e => e.Min(x => x.Id));
dbQuery = context.BaseItems.Where(e => tempQuery.Contains(e.Id));
var groupedIds = dbQuery.GroupBy(e => e.SeriesPresentationUniqueKey).Select(e => e.Min(x => x.Id)).ToList();
dbQuery = context.BaseItems.Where(e => groupedIds.Contains(e.Id));
}
else
{