[IGNITE-18196] .NET: Thin 3.0: LINQ: Aggregates

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-beta2
• Component/s: platforms, thin client
• Labels: .NET LINQ ignite-3

Language

C#

• Assignee: Pavel Tupitsyn
• Reporter: Pavel Tupitsyn
• Reviewer: Igor Sapego
• Created: 18/Nov/22 09:18
• Updated: 22/Nov/22 12:57
• Resolved: 22/Nov/22 12:57

Description

• Add support for Sum, Count, Min, Max, Average, Count, Any, All.
• Handle the case with SQL engine returning long instead of int for COUNT and SUM, which causes an exception during materialization:

System.ArgumentException : Object of type 'System.Int64' cannot be converted to type 'System.Int32'.
   at System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
   at System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo culture, BindingFlags invokeAttr)
   at System.Reflection.MethodBase.CheckArguments(StackAllocedArguments& stackArgs, ReadOnlySpan`1 parameters, Binder binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.ConstructorInfo.Invoke(Object[] parameters)
   at Apache.Ignite.Internal.Linq.IgniteQueryExecutor.<>c__DisplayClass9_0`1.<GetResultSelector>b__0(IReadOnlyList`1 cols, BinaryTupleReader& reader) in /home/pavel/w/ignite-3/modules/platforms/dotnet/Apache.Ignite/Internal/Linq/IgniteQueryExecutor.cs:line 146
   at Apache.Ignite.Internal.Sql.ResultSet`1.ReadRow(IReadOnlyList`1 cols, MessagePackReader& reader) in /home/pavel/w/ignite-3/modules/platforms/dotnet/Apache.Ignite/Internal/Sql/ResultSet.cs:line 226
   at Apache.Ignite.Internal.Sql.ResultSet`1.<>c__DisplayClass29_0.<<EnumerateRows>g__EnumeratePage|0>d.MoveNext() in /home/pavel/w/ignite-3/modules/platforms/dotnet/Apache.Ignite/Internal/Sql/ResultSet.cs:line 269
   at Apache.Ignite.Internal.Sql.ResultSet`1.EnumerateRows()+MoveNext() in /home/pavel/w/ignite-3/modules/platforms/dotnet/Apache.Ignite/Internal/Sql/ResultSet.cs:line 236
   at Apache.Ignite.Internal.Sql.ResultSet`1.EnumerateRows()+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at Apache.Ignite.Internal.Linq.IgniteQueryExecutor.ExecuteCollection[T](QueryModel queryModel)+MoveNext() in /home/pavel/w/ignite-3/modules/platforms/dotnet/Apache.Ignite/Internal/Linq/IgniteQueryExecutor.cs:line 85
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Apache.Ignite.Tests.Linq.LinqTests.TestGroupByWithCountAndSum() in /home/pavel/w/ignite-3/modules/platforms/dotnet/Apache.Ignite.Tests/Linq/LinqTests.GroupBy.cs:line 57

Reproducer:

        var query = PocoByteView.AsQueryable()
            .GroupBy(x => x.Val)
            .Select(x => new { x.Key, Count = (long)x.Count(), Sum = x.Sum(e => e.Key) })
            .OrderBy(x => x.Key);

        var res = query.ToList();

Issue Links

• is part of: IGNITE-17343 .NET: Thin 3.0: LINQ provider
• links to: GitHub Pull Request #1365
• links to: IGNITE-18196 .NET: LINQ: Add aggregates support by ptupitsyn · Pull Request #1365 · apache/ignite-3