[jira] [Updated] (ARROW-8344) [C#] StringArray.Builder.Clear() corrupts subsequent array contents

["Adam Szmigin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Szmigin updated ARROW-8344:
--------------------------------
    Environment: 
Windows 10 x64
Ubuntu Linux 18.04 LTS

  was:Windows 10 x64


> [C#] StringArray.Builder.Clear() corrupts subsequent array contents
> -------------------------------------------------------------------
>
>                 Key: ARROW-8344
>                 URL: https://issues.apache.org/jira/browse/ARROW-8344
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C#
>    Affects Versions: 0.16.0
>         Environment: Windows 10 x64
> Ubuntu Linux 18.04 LTS
>            Reporter: Adam Szmigin
>            Priority: Major
>
> h1. Summary
> Using the {{Clear()}} method on a {{StringArray.Builder}} class causes all subsequent built arrays to contain strings consisting solely of whitespace.  The below minimal example illustrates:
> {code:java}
> namespace ArrowStringArrayBuilderBug
> {
>     using Apache.Arrow;
>     using Apache.Arrow.Memory;
>     public class Program
>     {
>         private static readonly NativeMemoryAllocator Allocator
>             = new NativeMemoryAllocator();
>         public static void Main()
>         {
>             var builder = new StringArray.Builder();
>             AppendBuildPrint(builder, "Hello", "World");
>             builder.Clear();
>             AppendBuildPrint(builder, "Foo", "Bar");
>         }
>         private static void AppendBuildPrint(
>             StringArray.Builder builder, params string[] strings)
>         {
>             foreach (var elem in strings)
>                 builder.Append(elem);
>             var arr = builder.Build(Allocator);
>             System.Console.Write("Array contents: [");
>             for (var i = 0; i < arr.Length; i++)
>             {
>                 if (i > 0) System.Console.Write(", ");
>                 System.Console.Write($"'{arr.GetString(i)}'");
>             }
>             System.Console.WriteLine("]");
>         }
>     }
> {code}
> h2. Expected Output
> {noformat}
> Array contents: ['Hello', 'World']
> Array contents: ['Foo', 'Bar']
> {noformat}
> h2. Actual Output
> {noformat}
> Array contents: ['Hello', 'World']
> Array contents: ['   ', '   '] {noformat}
> h1. Workaround
> The bug can be trivially worked around by constructing a new {{StringArray.Builder}} instead of calling {{Clear()}}.
> The issue ARROW-7040 mentions other issues with string arrays in C#, but I'm not sure if this is related or not.



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