# Problem with numerical data in Arrow.jl

**URL:** <https://discourse.julialang.org/t/problem-with-numerical-data-in-arrow-jl/117218>\
**Category:** New to Julia\
**Tags:** arrow\
**Created:** [July 19, 2024, 7:38am UTC](https://discourse.julialang.org/t/problem-with-numerical-data-in-arrow-jl/117218 "2024-07-19T07:38:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Giobbe](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/giobbe/32/210758_2.png) [@Giobbe](https://discourse.julialang.org/u/Giobbe)\
**Post date:** [July 19, 2024, 7:38am UTC](https://discourse.julialang.org/t/problem-with-numerical-data-in-arrow-jl/117218/1 "2024-07-19T07:38:41Z")

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Hello to everyBody.  
I am trying to use Arrow.jl to store my DataFrames from a e-commerce DB and I noticed that the import function doesnt convert properly decimal values in the dataframes.

I post the comparison with CSV. Both switch my numbers to Float64 but CSV stores them properly.

 ![Diapositiva1](https://global.discourse-cdn.com/julialang/original/3X/8/2/8224acb10671003838479d532ebcdbd2d22bfb15.png)  
 ![Diapositiva2](https://global.discourse-cdn.com/julialang/original/3X/f/b/fb6bd29d0621f7f68c2cc4bbf6cb8ba5884de874.png)

I think I should need first to search for any FP columns in my original dataframes, convert them to Float64 and then store to Arrow files, but I wonder if there is a faster and simpler way like some arguments in the .write Arrow function…  
Any helps will be appreciated  
Giacomo

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<div class="post-metadata">

**Author:** ![Rudi79](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rudi79/32/3884_2.png) [@Rudi79](https://discourse.julialang.org/u/Rudi79)\
**Post date:** [July 19, 2024, 8:58am UTC](https://discourse.julialang.org/t/problem-with-numerical-data-in-arrow-jl/117218/2 "2024-07-19T08:58:56Z")

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Welcome to the forum!

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/please-read-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …

It is much easier to help you if your problem can be reproduced.

For your problem with the arrow types this might be helpful:

> **[User Manual · Arrow.jl](https://arrow.apache.org/julia/stable/manual/#Arrow-types)**
>
> Documentation for Arrow.jl.