apache / apache/arrow-java

[Java] Port Row Set abstraction from Drill to Arrow

Abierto
#372 2 comentarios 0 reacciones 0 asignados Ver en GitHub
Type: enhancement
Lenguaje dominante
Java
Estrellas
94
Forks
152
Merge medio
3 d 16 h
PR fusionados (30 d)
11

Descripción

Arrow is a great way to exchange data between systems. Somewhere in the process, however, data must be load into, and read out of the Arrow vectors.

Arrow's vector code started with similar code in Apache Drill. The Drill project created a "Row Set" abstraction that:
- Provides a simple way to define the schema for a set of batches.
- Loads data into vectors from row-oriented inputs.
- Reads data out of vectors in row-oriented output.
- Controls memory consumed by the record batch when loading data into vectors.
- Ensures maximum usage of the allocated vector space when loading data Into vectors.
- Optionally handles projection when reading data from an input file into a set of vectors.
- Optionally handles data conversion from input to vector formats.

This mechanism is handy for any Java developer who produces or consumes Arrow vectors.

Detailed information is available in [this wiki](https://github.com/paul-rogers/arrow/wiki), including a more detailed description of the motivation for this project, and an analysis of the work required to do the Drill-to-Arrow port.

The code is in Java simply because Drill is written in Java. The same mechanisms can be ported to other languages if useful. Those ports would be separate future projects.

The code will be placed in a new Java module which can be imported by projects that wish to use the code. Changes may be needed to expose items from the `vector` module; we'll tackle those issues if/when they occur.

**Reporter**: [Paul Rogers](https://issues.apache.org/jira/browse/ARROW-3164)

**Note**: *This issue was originally created as [ARROW-3164](https://issues.apache.org/jira/browse/ARROW-3164). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*

Guía de contribución

Abrir la guía de contribución

Línea de trabajo

Comienza con la wiki de Arrow enlazada, especialmente con su motivación y el análisis de la migración de Drill-to-Arrow. Revisa cómo debería interactuar el nuevo módulo Java propuesto con el módulo de vectores existente e identifica cualquier cambio necesario en la exposición. Se considera terminado cuando la abstracción Row Set se haya migrado a un módulo Java importable con las capacidades descritas de esquema, carga, lectura, memoria, proyección y conversión.

Escrito por el modelo de indexación a partir del texto del issue.

Evaluación

Stack tecnológico
java
Área
data
Tipo de issue
Nueva funcionalidad
Dificultad
5/5
Tiempo estimado
Más de una semana
Estado de actividad
Estancado
Claridad
Necesita aclaración
Aptitud para principiantes
20/100

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