You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: timestamp_selection.rs
    path of file: ./repos/materialize/src/adapter/src/coord
    
    the code of the file until where you have to start completion: // Copyright Materialize, Inc. and contributors. All rights reserve
    
    pub fn timestamp_or_default(&self) -> T {
        match self {
            Self::TimelineTimestamp { chosen_ts, .. } => chosen_ts.clone(),
            // Anything without a timestamp is given the maximum possible timestamp to indicate
            // that they have been closed up until the end of time. This allows us to SUBSCRIBE to
            // static views.
            Self::NoTimestamp => T::maximum(),
        }
    }