使用diesel查询数据时，没有为`&i64`实现特征`Queryable<BigInt，_>`

[dependencies]
diesel = { version = "1.4.8", features = ["postgres"] }
num-bigint = "0.4.3"

use diesel::sql_types::{Integer, BigInt as SqlBigInt};
use num_bigint::BigInt;
use diesel::deserialize::{self, FromSql};
use diesel::serialize::{self, ToSql, Output};
use std::io::Write;

// 实现FromSql trait
impl FromSql<SqlBigInt, Pg> for BigInt {
    fn from_sql(bytes: Option<&[u8]>) -> deserialize::Result<Self> {
        let bytes = not_none!(bytes);
        let s = String::from_utf8_lossy(bytes);
        Ok(BigInt::parse_bytes(s.as_ref(), 10)?)
    }
}

// 实现ToSql trait
impl ToSql<SqlBigInt, Pg> for BigInt {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        let s = self.to_string();
        out.write_all(s.as_bytes())?;
        Ok(serialize::IsNull::No)
    }
}

#[derive(Queryable)]
struct MyTable {
    id: i32,
    big_number: BigInt,
}