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Posted to issues@arrow.apache.org by "helmi (Jira)" <ji...@apache.org> on 2022/09/07 14:59:00 UTC
[jira] [Created] (ARROW-17644) Exception when reading binary arrow file (Value cannot be null. (Parameter 'name'))
helmi created ARROW-17644:
-----------------------------
Summary: Exception when reading binary arrow file (Value cannot be null. (Parameter 'name'))
Key: ARROW-17644
URL: https://issues.apache.org/jira/browse/ARROW-17644
Project: Apache Arrow
Issue Type: Bug
Components: C#
Reporter: helmi
Attachments: sample.arrow
Hi everyone,
I'm trying to read binary file using csharp apache arrow library v9.0.0 and I'm facing this exception
```
Unhandled exception. System.AggregateException: One or more errors occurred. (Value cannot be null. (Parameter 'name'))
---> System.ArgumentNullException: Value cannot be null. (Parameter 'name')
at Apache.Arrow.Field..ctor(String name, IArrowType dataType, Boolean nullable)
at Apache.Arrow.Ipc.MessageSerializer.FieldFromFlatbuffer(Field flatbufField, DictionaryMemo& dictionaryMemo)
at Apache.Arrow.Ipc.MessageSerializer.FieldFromFlatbuffer(Field flatbufField, DictionaryMemo& dictionaryMemo)
at Apache.Arrow.Ipc.MessageSerializer.GetSchema(Schema schema, DictionaryMemo& dictionaryMemo)
at Apache.Arrow.Ipc.ArrowStreamReaderImplementation.<ReadSchemaAsync>b__10_0(Memory`1 buff)
at Apache.Arrow.ArrayPoolExtensions.RentReturnAsync(ArrayPool`1 pool, Int32 length, Func`2 action)
at Apache.Arrow.Ipc.ArrowStreamReaderImplementation.ReadSchemaAsync()
at Apache.Arrow.Ipc.ArrowStreamReaderImplementation.ReadRecordBatchAsync(CancellationToken cancellationToken)
at Apache.Arrow.Ipc.ArrowStreamReaderImplementation.ReadNextRecordBatchAsync(CancellationToken cancellationToken)
```
As far as I do understand, the library is complaining about field name being null, not sure if it's the case since I tried to read the same file using apache arrow golang library and it seems to work without issue.
Please find attached the `sample.arrow` file
Below a sample code I'm using to read this arrow file:
*Csharp sample
```
using System;
using System.IO;
using System.Threading.Tasks;
using Apache.Arrow;
using Apache.Arrow.Ipc;
namespace arrow_csharp_issue
{
class Program
{
static async Task AsyncMain()
{
byte[] bytes = File.ReadAllBytes("./inputs/sample.arrow");
using (var memoryStream = new MemoryStream(bytes))
using (var reader = new ArrowStreamReader(memoryStream))
{
RecordBatch record = await reader.ReadNextRecordBatchAsync();
Console.WriteLine(record);
}
}
static void Main(string[] args)
{
AsyncMain().Wait();
}
}
}
```
* Golang sample
```
package main
import (
"bytes"
"fmt"
"os"
"github.com/apache/arrow/go/v9/arrow/ipc"
)
func main() {
data, err := os.ReadFile("./inputs/sample.arrow")
if err != nil {
panic(err)
}
reader, err := ipc.NewReader(bytes.NewReader(data))
if err != nil {
panic(err)
}
defer reader.Release()
reader.Next()
record := reader.Record()
fmt.Println(record)
}
```
Thank you
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