BulkInsert produces sytanx error on PostgreSQL (version 6.x)

Hi, first or all, thank you for all the efforts put into this library.

We're in the middle of trying to migrate our codebase from MSSQL to PostgreSQL, and have some difficoulties around bulk operations.

Before anything else, I'd like to emphasize that we're on .NET version 6, including related framework packages (EFCore, EFCore.Bulkextensions, etc. Namely we're using version 6.8.1 from bulk extensions. Unfortunately this is a hard constraint and we cannot put the huge efforts into upgrading to latest, or even to 7.x.

We have a model similar to this (simplified)

public class Company {
    public int Id { get; set; }
    public int? AddressId { get; set; }
    public Address Address { get; set; }
}

public class Address {
    public int Id { get; set; }
    public string BuildingNumber { get; set; }
    pubilc Coordinates Coordinates { get; set; }
}

public class Coordinates {
    public int SRID { get; set; }
    public decimal X { get; set; }
    public decimal Y { get; set; }
}

Type Coordinates is an owned type by Address, so it maps to columns like coordinates_x and so.

When calling BulkInsert on companies (using IncludeGraph), we get the following query in one of the commands, which produces syntax error at or near "INTO" SQL exception.

await dbContext.BulkInsertAsync(companies, o =>
{
    o.IncludeGraph = true;
}, cancellationToken: cancellationToken);

SELECT k.id, k.buildingnumber, t.id, t.coordinates_srid, t.coordinates_x, t.coordinates_y
FROM (
    INSERT INTO "public"."address" ("buildingnumber", "coordinates_srid", "coordinates_x", "coordinates_y") (SELECT "buildingnumber", "coordinates_srid", "coordinates_x", "coordinates_y" FROM "public"."addressTemp251c599b") ON CONFLICT ("id") DO UPDATE SET "buildingnumber" = EXCLUDED."buildingnumber", "coordinates_srid" = EXCLUDED."coordinates_srid", "coordinates_x" = EXCLUDED."coordinates_x", "coordinates_y" = EXCLUDED."coordinates_y" RETURNING "public"."address"."id", "public"."address"."buildingnumber", "public"."address"."coordinates_srid", "public"."address"."coordinates_x", "public"."address"."coordinates_y"
) AS k
LEFT JOIN (
    SELECT a.id, a.coordinates_srid, a.coordinates_x, a.coordinates_y
    FROM public.address AS a
    INNER JOIN public.address AS a0 ON a.id = a0.id
    WHERE (((a.coordinates_srid IS NOT NULL)) AND ((a.coordinates_x IS NOT NULL))) AND ((a.coordinates_y IS NOT NULL))
) AS t ON k.id = CASE
    WHEN (((t.coordinates_srid IS NOT NULL)) AND ((t.coordinates_x IS NOT NULL))) AND ((t.coordinates_y IS NOT NULL)) THEN t.id
END

One thing is that it has a syntax error regarding the SELECT .... FROM (INSERT INTO ...) structure.
Another strange thing is that it seems like the library does not properly handle owned types, the join to self seems unnecessary at first glance.

Any tips or advices are highly appreciated, thank you in advance.

borisdj / EFCore.BulkExtensions

BulkInsert produces sytanx error on PostgreSQL (version 6.x) #1516