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[jira] [Created] (ARROW-3962) [Go] Support null values while reading a CSV file.


Masashi Shibata created ARROW-3962:
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             Summary: [Go] Support null values while reading a CSV file.
                 Key: ARROW-3962
                 URL: https://issues.apache.org/jira/browse/ARROW-3962
             Project: Apache Arrow
          Issue Type: Bug
          Components: Go
            Reporter: Masashi Shibata


 

CSV reader doesn't support null values.
h1. How to reproduce

So when given a following CSV file,  `(csv.Reader).Next` return `false`. 
{code:java}
0;0;str-0
1;;str-1
;2;str-2
3;3;str-3
4;;str-4
5;5;str-5
6;6;
7;7;str-7
8;8;str-8
9;9;str-9{code}
 

The result of Example function in csv_test.go is:
{code:java}
# https://github.com/apache/arrow/blob/137a69e1fb6647dde5da9d18d9da47e7a9e694b0/go/arrow/csv/csv_test.go#L32-L90
rec[0]["i64"]: [0]
rec[1]["f64"]: [0]
rec[2]["str"]: ["str-0"]
rec[0]["i64"]: [1]
rec[1]["f64"]: [0]
rec[2]["str"]: ["str-1"]
{code}
The reason why stopping is csv.Reader got error while parsing empty string as a float64 (the error message is `strconv.ParseFloat: parsing "": invalid syntax`).



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