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use crate::{
relation::{Relation,QueryOutput},
};
pub mod fallback;
pub mod filter;
pub mod order;
pub mod request;
use request::*;
pub trait QueryPlanImpl<'a, Rel:'a, Req> {
fn prepare(rel: &'a Rel, req: Req)->Self;
}
pub trait QueryPlan<'a, Rel:'a + QueryOutput<'a>, Req:QueryRequest>:
QueryPlanImpl<'a, Rel, Req>
+ IntoIterator<Item = Rel::QueryRow>
+ Sized
{
fn execute(self)->Self::IntoIter { self.into_iter() }
}
impl<'a, Rel, Req, QP> QueryPlan<'a, Rel, Req> for QP
where QP: QueryPlanImpl<'a, Rel, Req>
+ IntoIterator<Item = Rel::QueryRow>,
Rel: 'a + QueryOutput<'a>,
Req: QueryRequest,
{}