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Posted to issues@arrow.apache.org by "Wes McKinney (Jira)" <ji...@apache.org> on 2019/08/21 14:18:00 UTC
[jira] [Assigned] (ARROW-3538) [Python] ability to override the
automated assignment of uuid for filenames when writing datasets
[ https://issues.apache.org/jira/browse/ARROW-3538?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wes McKinney reassigned ARROW-3538:
-----------------------------------
Assignee: Thomas Elvey
> [Python] ability to override the automated assignment of uuid for filenames when writing datasets
> -------------------------------------------------------------------------------------------------
>
> Key: ARROW-3538
> URL: https://issues.apache.org/jira/browse/ARROW-3538
> Project: Apache Arrow
> Issue Type: Wish
> Components: Python
> Affects Versions: 0.10.0
> Reporter: Ji Xu
> Assignee: Thomas Elvey
> Priority: Major
> Labels: datasets, features, parquet, pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> Say I have a pandas DataFrame {{df}} that I would like to store on disk as dataset using pyarrow parquet, I would do this:
> {code:java}
> table = pyarrow.Table.from_pandas(df)
> pyarrow.parquet.write_to_dataset(table, root_path=some_path, partition_cols=['a',]){code}
> On disk the dataset would look like something like this:
> {color:#14892c}some_path{color}
> {color:#14892c}├── a=1{color}
> {color:#14892c}____├── 4498704937d84fe5abebb3f06515ab2d.parquet{color}
> {color:#14892c}├── a=2{color}
> {color:#14892c}____├── 8bcfaed8986c4bdba587aaaee532370c.parquet{color}
> *Wished Feature:* It'd be great if I can override the auto-assignment of the long UUID as filename somehow during the *dataset* writing. My purpose is to be able to overwrite the dataset on disk when I have a new version of {{df}}. Currently if I try to write the dataset again, another new uniquely named [UUID].parquet file will be placed next to the old one, with the same, redundant data.
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