regression bug 3.1.1 => 3.1.2 (3.1.3 or 3.1.4) in the populating data from one column to two properties in the class.

The regression bug was found in the populating data from one column in DB table to two properties in the class. This bug occurs in 3.1.2 (and 3.1.3, and 3.1.4 (today build)), but not in 3.1.1 or less

Steps to reproduce

SQL test structure and inserting one row for the test:

create table test_mapping_column_2_prop
(
    id                bigserial     not null  constraint pk_test_map primary key,
    test_number       bigint     not null
);

insert into test_mapping_column_2_prop (test_number) values (777);

Class on C# (two properties to the one column):

[Table("test_mapping_column_2_prop")]
public partial class TestMappingColumn2PropInfo 
{
	[Column("id"),          PrimaryKey, Identity] public long Id         { get; set; } // bigint
	[Column("test_number"), NotNull             ] public long TestNumber { get; set; } // bigint

	[Column("test_number"), NotNull] public long TestNumberLast { get; set; } // bigint
}

The test C# code:

var testInfo = db.TestMappingColumn2Props.FirstOrDefault();

The output in the moment of selecting:

DataConnection: ====================================
08.10.2020 04:33:27.199  BeforeExecute
-- PostgreSQL PostgreSQL.9.5 PostgreSQL
DECLARE @take Integer -- Int32
SET     @take = 1

SELECT
	t1.id,
	t1.test_number,
	t1.test_number
FROM
	test_mapping_column_2_prop t1
LIMIT :take

DataConnection: ====================================
08.10.2020 04:33:27.204  Query Execution Time (AfterExecute): 00:00:00.0050989

DataConnection: ====================================
08.10.2020 04:33:27.213  Total Execution Time (Completed): 00:00:00.0146411. Rows Count: 1.

The screenshots with the debug breakpoints shown the problem.

Version 3.1.1 works well

Version 3.1.2 works wrong

Version 3.1.3 and 3.1.4(today build) work the same wrong as Version 3.1.2…

Environment details

linq2db version: 3.1.2 Database Server: PostgreSQL 12.1 Database Provider: Npgsql 4.1.4 Operating system: Windows 10 .NET Framework: .Net Core 3.1

[MaceWindu]

Could you provide more details why do you have two mappings for single column?

[AndrePScope]

Super! Thank you very much!!!