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Posted to jira@arrow.apache.org by "Joris Van den Bossche (Jira)" <ji...@apache.org> on 2021/11/23 13:00:00 UTC
[jira] [Closed] (ARROW-14785) [Rust] Support writing dictionaries nested in a list to IPC stream
[ https://issues.apache.org/jira/browse/ARROW-14785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joris Van den Bossche closed ARROW-14785.
-----------------------------------------
Resolution: Information Provided
> [Rust] Support writing dictionaries nested in a list to IPC stream
> ------------------------------------------------------------------
>
> Key: ARROW-14785
> URL: https://issues.apache.org/jira/browse/ARROW-14785
> Project: Apache Arrow
> Issue Type: Bug
> Components: Rust
> Reporter: Ameya Vikram
> Priority: Major
>
> Attempting to write/read dictionaries nested in a list to an IPC stream results in an error:
> {code:java}
> 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)
> }
> } {code}
> The error:
> {code:java}
> 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{code}
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