Initial commit

.gitignore

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+[Bb]in/
+[Oo]bj/
+.vscode
+.vs
+*.db
+*.suo
+*.user
+*.userosscache
+*.sln.docstates

EFCoreCoalesceNotEqualQueryIssue.cs

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+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Diagnostics;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+
+namespace EFCoreCoalesceNotEqualQueryIssue
+{
+    public class Data
+    {
+        [System.ComponentModel.DataAnnotations.Required]
+        public int? Id { get; set; }
+
+        public int? TestId { get; set; }
+
+        public string Name { get; set; }
+    }
+
+    class TestDbContext : DbContext
+    {
+        private readonly ILoggerFactory loggerFactory;
+
+        public TestDbContext( ILoggerFactory loggerFactory )
+        {
+            this.loggerFactory = loggerFactory;
+        }
+
+        public DbSet<Data> Data { get; set; }
+
+        protected override void OnConfiguring( DbContextOptionsBuilder optionsBuilder )
+        {
+            base.OnConfiguring( optionsBuilder );
+            optionsBuilder.UseSqlite( new Microsoft.Data.Sqlite.SqliteConnection("Data Source=test.db") );
+            optionsBuilder.UseLoggerFactory( loggerFactory );
+        }
+    }
+
+    class Repro
+    {
+        static void Main( )
+        {
+            var context = new TestDbContext( new LoggerFactory( ).AddConsole( LogLevel.Debug ) );
+            if( context.Database.EnsureCreated( ) )
+            {
+                context.Data.Add( new Data { Name = "HasTestId", TestId = 123 } );
+                context.Data.Add( new Data { Name = "ZeroTestId", TestId = 0 } );
+                context.Data.Add( new Data { Name = "NullTestId", TestId = null } );
+
+                context.SaveChanges( );
+            }
+
+            var noMainLinked = context.Data.Where( o => (o.TestId ?? 0) != 0)
+                .Select( o => o.Name )
+                .ToList( );
+
+            var expected = new HashSet<string>( new [] { "HasTestId" } );
+            Debug.Assert( expected.SetEquals( noMainLinked ), "Failed to get expected data");
+            return;
+        }
+    }
+}

EFCoreCoalesceNotEqualQueryIssue.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFrameworks>netcoreapp2.0;netcoreapp2.1;netcoreapp2.2</TargetFrameworks>
+    <PreserveCompilationContext>true</PreserveCompilationContext>
+    <AssemblyName>test</AssemblyName>
+    <OutputType>Exe</OutputType>
+    <PackageId>test</PackageId>
+    <TypeScriptCompileBlocked>false</TypeScriptCompileBlocked>
+    <TypeScriptToolsVersion>Latest</TypeScriptToolsVersion>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.2' ">
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.2.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.2.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.2.*" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.2.*" />
+  </ItemGroup>  
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.1' ">
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.1.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.1.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.1.*" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.*" />
+  </ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.0' ">
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.0.*" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="2.0.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.0.*" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.0.*" />
+  </ItemGroup>
+</Project>