Redshift numeric issue after upgrading to cluster version 1.0.27554

After upgrading Redshift from cluster version 1.0.27085 to 1.0.27554, the numeric values returned from queries through npgsql are way off.

Steps to reproduce

Execute a query that returns a numeric and extract it using either GetDecimal og GetDouble:

await using(var conn = new NpgsqlConnection(connString))
{
    await conn.OpenAsync();
    
     await using (var cmd = new NpgsqlCommand("select cast(12.34 as numeric(8,2)) as n", conn))
    {
        await using (var reader = await cmd.ExecuteReaderAsync())
        {
            while (await reader.ReadAsync())
            {
                Console.WriteLine(reader.GetDecimal(0));
            }
        }
    }
}

The issue

The above code writes 123400000000,0000 and not as expected the value 12.34

When executing the code against a cluster with version 1.0.27085, the correct value 12.34 is returned.

Using ODBC driver still returns the correct numeric values on cluster version 1.0.27554.

For now, I have downgraded our cluster to 1.0.27085 and deferred the maintenance window until the 23rd of July, but after that I’m going to have big issues.

Further technical details

Npgsql version: 5.0.7 Redshift version: 1.0.27554 Operating system: N/A

[faarbaek]

I just tried to create a new cluster, and it seems like this issue has been solved by AWS as with the new cluster version 1.0.27747 it works like expected.

[YohDeadfall]

Could you post binary data returned by Red Shift? And have you contacted their support and tried another drivers? You even can try to execute a query in DataGrip or any other JetBrains product since all of them utilize JDBC.