apache / apache/arrow-java

[Java] Port Row Set abstraction from Drill to Arrow

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#372 2 commentaires 0 réactions 0 personnes assignées Voir sur GitHub
Type: enhancement
Langage dominant
Java
Étoiles
94
Forks
152
Merge moyen
3 j 16 h
PR mergées (30 j)
11

Description

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.*

Guide de contribution

Ouvrir le guide de contribution

Piste de recherche

Commencez par consulter le wiki Arrow indiqué, en particulier sa motivation et son analyse du portage de Drill-to-Arrow. Examinez comment le nouveau module Java proposé devrait interagir avec le module vectoriel existant et identifiez les éventuelles modifications d’exposition nécessaires. Le travail est terminé lorsque l’abstraction Row Set est portée dans un module Java importable doté des fonctionnalités décrites de schéma, de chargement, de lecture, de mémoire, de projection et de conversion.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Évaluation

Stack technique
java
Domaine
data
Type d'issue
Fonctionnalité
Difficulté
5/5
Temps estimé
Plus d'une semaine
Activité
À l'abandon
Clarté
À clarifier
Accessibilité débutants
20/100

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