Yeah, sorry that wasn't very clear. One option for a partial update is do define a new `Update` struct:

    struct Bar {
        id: Uuid,
        column_1: i64,
        column_2: i64,
        column_3: String,
        column_4: Uuid,
    }

    struct UpdateBar {
        column_1: Option<i64>,
        column_2: Option<i64>,
        column_3: Option<String>,
        column_4: Option<Uuid>,
    }

    UPDATE some_table SET
    column_1 = COALESCE($1, column_1),
    column_2 = COALESCE($2, column_2),
    column_3 = COALESCE($3, column_3),
    column_4 = COALESCE($4, column_4),
    WHERE id = some_id;

Or, you just never do partial updates :)