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Posted to jira@arrow.apache.org by "Ziru Niu (Jira)" <ji...@apache.org> on 2020/09/29 13:37:00 UTC

[jira] [Created] (ARROW-10132) Considers scientific notation when inferring schema from csv

Ziru Niu created ARROW-10132:
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             Summary: Considers scientific notation when inferring schema from csv
                 Key: ARROW-10132
                 URL: https://issues.apache.org/jira/browse/ARROW-10132
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust
    Affects Versions: 1.0.1
         Environment: Ubuntu
            Reporter: Ziru Niu


 
||col||
|1.2|
|1.3e-2|
|1.4|

Currently this column would be inferred as Utf8 type, since csv::reader::DECIMAL_RE is defined as r"^-?(\d+\.\d+)$". Maybe we could change this to r"^-?(\d+\.\d+)(e-?(\d+))?$" or similar stuff to allow scientific notation of real number inferred as float?

 

(The RE I currently proposed doesn't handle "5e-4" correctly though)

 

And I would wish we could infer "3." or ".3" as float too. I will come up with an exact RE when I get time.

 



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