Server side prepared statements 'bit' parameters generate errors.

Hello

I have run into a problem after upgrading from 9.03 to the 9.05.04 ODBC
driver. Parameters of type 'bit' seem to be interpreted as 'char' in some
cases when using server side prepared statements.

If I execute the query
select * from some_table where ?;
with a bit parameter then I get an error that reads:
ERROR [42804] ERROR: argument of WHERE must be type boolean, not type
"char";

The error is not reproducible is I set the connection string
parameter UseServerSidePrepare=0. It also isn't reproducible in version
9.03 regardless of the value of UseServerSidePrepare. The problem seems to
only affect bit parameters. A program that duplicates the problem follows
at the end of this email. I am using the driver distributed in
"psqlodbc_09_05_0400-x64.zip" on Windows 10. I have tested PostgreSQL
version 9.4 and 9.5.

Have I run into a bug in the driver, or is this a server issue? Any help
would be much appreciated.

Regards,
Johan Levin

Program listing: (C#)

using System.Data.Odbc;
using System.Diagnostics;
internal class Program
{
private static void Main(string[] args)
{
// Command line: Server, User, Password, Database,
UseServerSidePrepare
// Database schema and data:
// create table some_table (id int, name varchar(20));
// insert into some_table values (42, 'Arthur Dent');

Trace.Assert(args.Length == 5, "Wrong number of command line
arguments.");
var connStr = string.Format("Driver={{PostgreSQL
Unicode(x64)}};Server={0};Uid={1};Pwd={2};Database={3};UseServerSidePrepare={4}",
args);
using (var connection = new OdbcConnection(connStr))
using (var command = connection.CreateCommand())
{
connection.Open();
command.CommandText = "select * from some_table where ?;";
command.Parameters.Add(new OdbcParameter
{
OdbcType = OdbcType.Bit,
Value = 1
});
command.ExecuteNonQuery(); // <-- Exception here if
UseServerSidePrepare=1
// OdbcException.Message =
// ERROR [42804] ERROR: argument of WHERE must be type
boolean, not type "char";
// Error while executing the query
}
}
}