# \[ANN\] A new lightning fast package for data manipulation in pure Julia

**URL:** <https://discourse.julialang.org/t/ann-a-new-lightning-fast-package-for-data-manipulation-in-pure-julia/78197>\
**Category:** Package Announcements\
**Tags:** data, dataframes, inmemorydatasets\
**Created:** [March 21, 2022, 7:35am UTC](https://discourse.julialang.org/t/ann-a-new-lightning-fast-package-for-data-manipulation-in-pure-julia/78197 "2022-03-21T07:35:42Z")\
**Posts on this page:** 1\
**Showing post:** 42

<div class="post-metadata">

**Author:** ![DataFrames](https://avatars.discourse-cdn.com/v4/letter/d/e19b73/32.png) [@DataFrames](https://discourse.julialang.org/u/DataFrames)\
**Post date:** [March 24, 2022, 12:21am UTC](https://discourse.julialang.org/t/ann-a-new-lightning-fast-package-for-data-manipulation-in-pure-julia/78197/42 "2022-03-24T00:21:40Z")

</div>

> [@Honarvaghtan](#):
>
> but there are some incorrect rows in the output, though it works fine for MWE, any idea?

Your program produces incorrect results for rows where :v1 is missing, use

```julia
julia> byrow(df, isless, [:v1, :v2, :v3], with = byrow(df, coalesce, :), lt = f)

```

---

_[View the full topic](https://discourse.julialang.org/t/ann-a-new-lightning-fast-package-for-data-manipulation-in-pure-julia/78197)._