resolves #2288

warning: usage of `FromIterator::from_iter`
   --> src/cmd/stats.rs:789:27
    |
789 |                 work_br = csv::ByteRecord::from_iter(vec![&*header].into_iter().chain(stat));
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `.collect()` instead of `::from_iter()`: `vec![&*header].into_iter().chain(stat).collect::<csv::ByteRecord<_>>()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#from_iter_instead_of_collect
    = note: `-W clippy::from-iter-instead-of-collect` implied by `-W clippy::pedantic`
    = help: to override `-W clippy::pedantic` add `#[allow(clippy::from_iter_instead_of_collect)]`

warning: implicitly cloning a `ByteRecord` by calling `to_owned` on its dereferenced type
   --> src/cmd/stats.rs:803:31
    |
803 |             stats_br_vec.push(dataset_stats_br.to_owned());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `dataset_stats_br.clone()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_clone
    = note: `-W clippy::implicit-clone` implied by `-W clippy::pedantic`
    = help: to override `-W clippy::pedantic` add `#[allow(clippy::implicit_clone)]`

warning: implicitly cloning a `ByteRecord` by calling `to_owned` on its dereferenced type
   --> src/cmd/stats.rs:812:31
    |
812 |             stats_br_vec.push(dataset_stats_br.to_owned());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `dataset_stats_br.clone()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_clone

warning: implicitly cloning a `ByteRecord` by calling `to_owned` on its dereferenced type
   --> src/cmd/stats.rs:825:31
    |
825 |             stats_br_vec.push(dataset_stats_br.to_owned());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `dataset_stats_br.clone()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implicit_clone

…re write_dataset_stat

…d use simd_json instead of serde_json

…ng approach

also refactor csv_to_jsonl to pass output_jsonl by reference instead of by value

…stead of by value

…vel objects

so as not to trigger select where objects starting with _ is a sentinel for last column

…el stats

also add assert_succes to select frequency and tojsonl tests to help in debugging