message: add better error logging
diff: @@ -517,7 +517,7 @@ impl TryFrom<i16> for ColType {
  0x0030 => Ok(ColType::Udt),
  0x0031 => Ok(ColType::Tuple),
  0x0080 => Ok(ColType::Varchar),
  - _ => Err("Unexpected column type".into()),
  + _ => Err(format!("Unexpected column type {:?}", value).into()),
  }
  }
  }
  