Iterator fix

FAnsiSql/Implementations/PostgreSql/PostgreSqlTableHelper.cs

@@ -89,8 +89,6 @@ private static IEnumerable<string> ListPrimaryKeys(IManagedConnection con, Disco
                                          AND indisprimary
                              """;
 
-        var toReturn = new List<string>();
-
         using var cmd = table.GetCommand(query, con.Connection);
         cmd.Transaction = con.Transaction;
 
@@ -100,7 +98,8 @@ AND indisprimary
         cmd.Parameters.Add(p);
 
         using var r = cmd.ExecuteReader();
-        yield return (string)r["attname"];
+        while(r.Read())
+            yield return (string)r["attname"];
 
         r.Close();
     }

Tests/FAnsiTests/CrossPlatformTests.cs

@@ -562,7 +562,6 @@ public void AddColumnTest(DatabaseType type,bool useTransaction)
 
         Assert.Multiple(() =>
         {
-
             //table should exist
             Assert.That(tbl.Exists());