[IGNITE-14343] .NET: Allow arbitrary MemberInit projections in LINQ

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: platforms
• Labels: .NET LINQ
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Pavel Tupitsyn
• Reporter: Pavel Tupitsyn
• Created: 18/Mar/21 17:08
• Updated: 11/Nov/22 06:47

Description

Ignite LINQ provider allows anonymous type projections:

query.Select(emp => new {Id = emp.Key, Name = emp.Value.Name});

However, it does not work with a custom class:

query.Select(emp => new Foo {Id = emp.Key, Name = emp.Value.Name});

throws exception:

System.NotSupportedException : The expression 'new Foo() {Id = [x].Key}' (type: System.Linq.Expressions.MemberInitExpression) is not supported.

Add VisitMemberInit overload to CacheQueryExpressionVisitor to support this scenario. See linked SO page for more details - there is a proposed fix as well.

Issue Links

• is cloned by: IGNITE-18120 .NET: Thin 3.0: Allow arbitrary MemberInit projections in LINQ
• links to: Stackoverflow: Ignite LINQ provider projection support for non-anonymous types