Function plan_parameter

src/sql/src/plan/query.rs:4168–4183

(ecx: &ExprContext, n: usize)

}

fn plan_parameter(ecx: &ExprContext, n: usize) -> Result<CoercibleScalarExpr, PlanError> {
    if !ecx.allow_parameters {
        // It might be clearer to return an error like "cannot use parameter
        // here", but this is how PostgreSQL does it, and so for now we follow
        // PostgreSQL.
        return Err(PlanError::UnknownParameter(n));
    }
    if n == 0 || n > 65536 {
        return Err(PlanError::UnknownParameter(n));
    }
    if ecx.param_types().borrow().contains_key(&n) {
        Ok(HirScalarExpr::parameter(n).into())
    } else {
        Ok(CoercibleScalarExpr::Parameter(n))
    }
}

fn plan_row(ecx: &ExprContext, exprs: &[Expr<Aug>]) -> Result<CoercibleScalarExpr, PlanError> {
    let mut out = vec![];