[ARROW-3962] [Go] Support null values while reading a CSV file.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: Go
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20566
• Assignee: Brian Gold
• Reporter: Masashi Shibata
• Created: 08/Dec/18 11:32
• Updated: 11/Jan/23 07:30
• Resolved: 27/Nov/19 08:28

Description

 

CSV reader doesn't support null values.

How to reproduce

So when given a following CSV file,  `(csv.Reader).Next` return `false`. 

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

 

The result of Example function in csv_test.go is:

# 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"]

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`).

Issue Links

• links to: GitHub Pull Request #3129
• links to: GitHub Pull Request #4346