[jira] [Updated] (ARROW-17318) [C++][Dataset] Support async streaming interface for getting fragments in Dataset

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-17318:
-----------------------------------
    Labels: c++ dataset pull-request-available  (was: c++ dataset)

> [C++][Dataset] Support async streaming interface for getting fragments in Dataset
> ---------------------------------------------------------------------------------
>
>                 Key: ARROW-17318
>                 URL: https://issues.apache.org/jira/browse/ARROW-17318
>             Project: Apache Arrow
>          Issue Type: Sub-task
>            Reporter: Pavel Solodovnikov
>            Assignee: Pavel Solodovnikov
>            Priority: Major
>              Labels: c++, dataset, pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Add `GetFragmentsAsync()` and `GetFragmentsAsyncImpl()` functions to the generic `Dataset` interface, which allows to produce fragments in a streamed fashion.
> This is one of the prerequisites for making `FileSystemDataset` to support lazy fragment processing, which, in turn, can be used to start scan operations without waiting for the entire dataset to be discovered.
> To aid the transition process of moving to async implementation in `Dataset`/`AsyncScanner` code, a default implementation for `GetFragmentsAsyncImpl()` should be provided (yielding a VectorGenerator over the fragments vector, which is stored by every implementation of Dataset interface at the moment).



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