unsubscribe On Sat, Apr 18, 2020 at 5:43 AM Christian Beilschmidt (Jira) < j...@apache.org> wrote:
> Christian Beilschmidt created ARROW-8508: > -------------------------------------------- > > Summary: [Rust] ListBuilder of FixedSizeListBuilder creates > wrong offsets > Key: ARROW-8508 > URL: https://issues.apache.org/jira/browse/ARROW-8508 > Project: Apache Arrow > Issue Type: Bug > Components: Rust > Affects Versions: 0.16.0 > Reporter: Christian Beilschmidt > > > I created an example of storing multi points with Arrow. > # A coordinate consists of two floats (Float64Builder) > # A multi point consists of one or more coordinates (FixedSizeListBuilder) > # A list of multi points consists of multiple multi points (ListBuilder) > > This is the corresponding code snippet: > {code:java} > let float_builder = arrow::array::Float64Builder::new(0); > let coordinate_builder = > arrow::array::FixedSizeListBuilder::new(float_builder, 2); > let mut multi_point_builder = > arrow::array::ListBuilder::new(coordinate_builder); > > multi_point_builder > .values() > .values() > .append_slice(&[0.0, 0.1]) > .unwrap(); > multi_point_builder.values().append(true).unwrap(); > multi_point_builder > .values() > .values() > .append_slice(&[1.0, 1.1]) > .unwrap(); > multi_point_builder.values().append(true).unwrap(); > > multi_point_builder.append(true).unwrap(); // first multi point > > multi_point_builder > .values() > .values() > .append_slice(&[2.0, 2.1]) > .unwrap(); > multi_point_builder.values().append(true).unwrap(); > multi_point_builder > .values() > .values() > .append_slice(&[3.0, 3.1]) > .unwrap(); > multi_point_builder.values().append(true).unwrap(); > multi_point_builder > .values() > .values() > .append_slice(&[4.0, 4.1]) > .unwrap(); > multi_point_builder.values().append(true).unwrap(); > > multi_point_builder.append(true).unwrap(); // second multi point > > let multi_point = dbg!(multi_point_builder.finish()); > > let first_multi_point_ref = multi_point.value(0); > let first_multi_point: &arrow::array::FixedSizeListArray = > first_multi_point_ref.as_any().downcast_ref().unwrap(); > let coordinates_ref = first_multi_point.values(); > let coordinates: &Float64Array = > coordinates_ref.as_any().downcast_ref().unwrap(); > > assert_eq!(coordinates.value_slice(0, 2 * 2), &[0.0, 0.1, 1.0, 1.1]); > > let second_multi_point_ref = multi_point.value(1); > let second_multi_point: &arrow::array::FixedSizeListArray = > second_multi_point_ref.as_any().downcast_ref().unwrap(); > let coordinates_ref = second_multi_point.values(); > let coordinates: &Float64Array = > coordinates_ref.as_any().downcast_ref().unwrap(); > > assert_eq!(coordinates.value_slice(0, 2 * 3), &[2.0, 2.1, 3.0, 3.1, 4.0, > 4.1]); > {code} > The second assertion fails and the output is {{[0.0, 0.1, 1.0, 1.1, 2.0, > 2.1]}}. > > Moreover, the debug output produced from {{dbg!}} confirms this: > {noformat} > [ > FixedSizeListArray<2> > [ > PrimitiveArray<Float64> > [ > 0.0, > 0.1, > ], > PrimitiveArray<Float64> > [ > 1.0, > 1.1, > ], > ], > FixedSizeListArray<2> > [ > PrimitiveArray<Float64> > [ > 0.0, > 0.1, > ], > PrimitiveArray<Float64> > [ > 1.0, > 1.1, > ], > PrimitiveArray<Float64> > [ > 2.0, > 2.1, > ], > ], > ]{noformat} > The second list should contain the values 2-4. > > > > So either I am using the builder wrong or there is a bug with the offsets. > I used {{0.16}} as well as the current {{master}} from GitHub. > > > > -- > This message was sent by Atlassian Jira > (v8.3.4#803005) > -- https://plus.google.com/u/0/+LeeNelsontechnologiclee/about/p/pub <https://plus.google.com/+LeeNelsontechnologiclee/about/p/pub> Google Voice: +1 -864-372-9533 China Tel: +86-177-2798-8544 technologic...@yahoo.com -Unmonitored 2775318...@qq.com
