message: Fix type decution: do not use FixedString(...) for regular strings
diff: @@ -233,7 +233,7 @@ std::string convertCTypeToDataSourceType(const BoundTypeInfo & type_info) {
  switch (type_info.c_type) {
  case SQL_C_WCHAR:
  case SQL_C_CHAR:
  - return (type_info.value_max_size > 0 ? ("FixedString(" + std::to_string(type_info.value_max_size) + ")") : "String");
  + return "String";
  case SQL_C_BIT:
  return "UInt8";
  @@ -318,7 +318,7 @@ std::string convertSQLTypeToDataSourceType(const BoundTypeInfo & type_info) {
  switch (type_info.sql_type) {
  case SQL_WCHAR:
  case SQL_CHAR:
  - return (type_info.value_max_size > 0 ? ("FixedString(" + std::to_string(type_info.value_max_size) + ")") : "String");
  + return "String";
  case SQL_WVARCHAR:
  case SQL_VARCHAR:
  