[jira] [Commented] (ARROW-7965) [Python] Hold a reference to the dataset factory for later reuse

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-7965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17072496#comment-17072496 ] 

Joris Van den Bossche commented on ARROW-7965:
----------------------------------------------

This depends on ARROW-8164, but if that gets merged quickly, it would be nice tackle this issue for 0.17 since that would enable us to remove `factory()` from the high-level user API (which wasn't there yet in 0.16, so this would avoid it ever being in a released version)

> [Python] Hold a reference to the dataset factory for later reuse
> ----------------------------------------------------------------
>
>                 Key: ARROW-7965
>                 URL: https://issues.apache.org/jira/browse/ARROW-7965
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Krisztian Szucs
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.17.0
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> Provide a more intuitive way to construct nested dataset:
> ```python
> # instead of using confusing factory function
> dataset([
>      factory("s3://old-taxi-data", format="parquet"),
>      factory("local/path/to/new/data", format="csv")
> ])
> # let the user to construct a new dataset directly from dataset objects
> dataset([ 
>     dataset("s3://old-taxi-data", format="parquet"),
>     dataset("local/path/to/new/data", format="csv")
> ])
> ```
> In the future we might want to introduce a new Dataset class which wraps functionality of both the dataset actory and the materialized dataset enabling optimizations over rediscovery of already materialized datasets. 



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