Bug #31720 MyODBC 5.1 / ADO can't open a recordset that has a Decimal field

Description:
The following error is received when a record set containing two fields INT, and DECIMAL (10,2) is opened and rs.MoveFirst() is called.

Error: Source: Microsoft OLE DB Provider for ODBC Drivers  Line 78  Column 4
[MySQL][ODBC 5.1 Driver][mysqld-5.0.45-community-nt]Restricted data type attribute violation(SQL_C_NUMERIC)

A test case for this bug is found in /odbc-testing/ado-conformance/trunk/bugs/bug#.vbs

How to repeat:
Sub Test()	
    Dim strSQL, strConn, oConn, oRs, fld

    Set oConn = CreateObject("ADODB.Connection")
    Set oRs = CreateObject("ADODB.RecordSet")
    strSQL = "select * from test.26110"

    oConn.ConnectionString = connstr
	
    oConn.CursorLocation = CInt(adUseClient)
    oConn.Open
	
    Err.Clear
    oRs.Open strSQL, oConn, adOpenStatic
    If Err.Number <> 0 Then
	Assert.Failure "failed to open record set"
    End If
    oRs.MoveFirst    <------ FAILS HERE

    ' VERIFY
    For Each fld In oRs.Fields
	assert.Trace fld.Name & ":" & fld.Value
    Next

    oConn.Close
    oRs.Close
    Set oConn = Nothing
    Set oRs = Nothing
End Sub

This is a duplicate of bug #3028

problem:

ScriptUnit      350-450	EXIT  SQLSetDescField  with return code -1 (SQL_ERROR)
		SQLHDESC            009F1BDC
		SQLSMALLINT                  1 
		SQLSMALLINT               1004 <SQL_DESC_OCTET_LENGTH_PTR>
		SQLPOINTER          0012E0F0
		SQLINTEGER                   0 

		DIAG [HY015] [MySQL][ODBC 5.1 Driver][mysqld-5.0.41-community-nt-log]Invalid parameter type (28) 

Fix:
Index: driver/desc.c
===================================================================
--- driver/desc.c       (revision 885)
+++ driver/desc.c       (working copy)
@@ -672,6 +672,10 @@

   dest= ((char *)dest_struct) + fld->offset;

+  /* some applications and even MSDN examples don't give a correct constant */
+  if (buflen == 0)
+    buflen= fld->data_type;
+
   /* TODO checks when strings? */
   if ((fld->data_type == SQL_IS_POINTER && buflen != SQL_IS_POINTER) ||
       (fld->data_type != SQL_IS_POINTER && buflen == SQL_IS_POINTER))

Fix committed and will be release in 5.1.1.

A note has been added to the 5.1.1 changelog: 

ADO applications would not open a RecordSet that contained a DECIMAL field.