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  1. Apache Arrow
  2. ARROW-14785

[Rust] Support writing dictionaries nested in a list to IPC stream

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Information Provided
    • None
    • None
    • Rust
    • None

    Description

      Attempting to write/read dictionaries nested in a list to an IPC stream results in an error:

      fn send_receive() -> std::result::Result<(), Box<dyn std::error::Error>> {
          let fields_vec = vec!["fields1", "fields2"];
          let fields_list = {
                  let mut b = ListBuilder::with_capacity(StringDictionaryBuilder::new(PrimitiveBuilder::<Int32Type>::new(2), StringBuilder::new(2)), 1);
                  for f in &fields_vec {
                      b.values().append(f).unwrap();
                      }
                  b.append(true)?;
                  b.finish()
              };
          let schema = Arc::new(Schema::new(vec![Field::new("fields", fields_list.data_type().clone(), false)]));
          let batch = RecordBatch::try_new(schema.clone(),vec![Arc::new(fields_list)])?;
          let buf = Vec::with_capacity(1024 * 32);
          let mut writer = arrow::ipc::writer::StreamWriter::try_new(buf, &schema)?;
          writer.write(&batch)?;
          writer.finish()?;    let reader = &writer.into_inner()?[..];
          let mut reader = arrow::ipc::reader::StreamReader::try_new(reader)?;
          while let Some(n) = reader.next() {
              let b = n?;
              println!("Parsed batch: {:?}", b);
          }
          Ok(())
      }
      
      fn main() {
          println!("Sending DictionaryArray in a list");
          match send_receive() {
              Ok(_) => println!("Encoded and decoded successfully"),
              Err(e) => panic!("{:?}", e)
          }
      } 

      The error:

      Sending DictionaryArray in a list
      thread 'main' panicked at 'index out of bounds: the len is 1 but the index is 1', .cargo/registry/src/github.com-1ecc6299db9ec823/arrow-6.2.0/src/ipc/reader.rs:176:31
      stack backtrace:
         0: rust_begin_unwind
         1: core::panicking::panic_fmt
         2: core::panicking::panic_bounds_check
         3: arrow::ipc::reader::create_array
                   at .cargo/registry/src/github.com-1ecc6299db9ec823/arrow-6.2.0/src/ipc/reader.rs:176:31
         4: arrow::ipc::reader::create_array
                   at .cargo/registry/src/github.com-1ecc6299db9ec823/arrow-6.2.0/src/ipc/reader.rs:100:26
         5: arrow::ipc::reader::read_record_batch
                   at .cargo/registry/src/github.com-1ecc6299db9ec823/arrow-6.2.0/src/ipc/reader.rs:432:22
         6: arrow::ipc::reader::StreamReader<R>::maybe_next
                   at .cargo/registry/src/github.com-1ecc6299db9ec823/arrow-6.2.0/src/ipc/reader.rs:875:17
         7: <arrow::ipc::reader::StreamReader<R> as core::iter::traits::iterator::Iterator>::next
                   at .cargo/registry/src/github.com-1ecc6299db9ec823/arrow-6.2.0/src/ipc/reader.rs:908:9
         8: rust_arrow::send_receive
                   at ./src/main.rs:58:25
         9: rust_arrow::main
                   at ./src/main.rs:81:11

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            Unassigned Unassigned
            amvikram Ameya Vikram
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              Updated:
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