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: opt_state.rs
    path of file: ./repos/polars/crates/polars-plan/src/frame
    
    the code of the file until where you have to start completion: #[derive(Copy, Clone, Debug)]
/// State of the allowed optimizations
pub struct OptState {
    /// Only read columns that are used later in the query.
    p
    
    fn default() -> Self {
        OptState {
            projection_pushdown: true,
            predicate_pushdown: true,
            type_coercion: true,
            simplify_expr: true,
            slice_pushdown: true,
            // will be toggled by a scan operation such as csv scan or parquet scan
            file_caching: false,
            #[cfg(feature = "cse")]
            comm_subplan_elim: true,
            #[cfg(feature = "cse")]
            comm_subexpr_elim: true,
            streaming: false,
            fast_projection: true,
            eager: false,
            row_estimate: true,
        }
    }