Details
-
Bug
-
Status: Resolved
-
Major
-
Resolution: Fixed
-
0.16.0
-
Windows 10 x64
Ubuntu Linux 18.04 LTS x64
Description
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:
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("]");
}
}
Expected Output
Array contents: ['Hello', 'World'] Array contents: ['Foo', 'Bar']
Actual Output (Windows 10 x64)
Array contents: ['Hello', 'World'] Array contents: [' ', ' ']
Actual Output (Ubuntu 18.04 LTS x64)
Array contents: ['Hello', 'World'] Array contents: ['', '']
Workaround
The bug can be trivially worked around by constructing a new StringArray.Builder instead of calling Clear().
Attachments
Issue Links
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