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https://issues.apache.org/jira/browse/ARROW-8344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-8344:
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Labels: pull-request-available (was: )
> [C#] StringArray.Builder.Clear() corrupts subsequently-built 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 x64
> Reporter: Adam Szmigin
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h1. Summary
> Using the {{Clear()}} method on a {{StringArray.Builder}} class causes all
> subsequently-built arrays to contain corrupted strings, either consisting
> solely of whitespace or the empty string: the outcome appears OS-specific.
> 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 (Windows 10 x64)
> {noformat}
> Array contents: ['Hello', 'World']
> Array contents: [' ', ' ']{noformat}
> h2. Actual Output (Ubuntu 18.04 LTS x64)
> {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()}}.
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