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Posted to issues@flink.apache.org by "Francesco Guardiani (Jira)" <ji...@apache.org> on 2021/10/04 14:12:00 UTC
[jira] [Assigned] (FLINK-19903) Allow to read metadata in
filesystem connector
[ https://issues.apache.org/jira/browse/FLINK-19903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Francesco Guardiani reassigned FLINK-19903:
-------------------------------------------
Assignee: Francesco Guardiani
> Allow to read metadata in filesystem connector
> ----------------------------------------------
>
> Key: FLINK-19903
> URL: https://issues.apache.org/jira/browse/FLINK-19903
> Project: Flink
> Issue Type: New Feature
> Components: Connectors / FileSystem, Table SQL / Ecosystem
> Reporter: Ruben Laguna
> Assignee: Francesco Guardiani
> Priority: Minor
> Labels: auto-deprioritized-major, pull-request-available
> Attachments: image-2020-11-03-08-53-03-714.png
>
>
> Use case:
> I have a dataset where they embedded some information in the filenames
> (200k files) and I need to extract that as a new column.
> In Spark I could `
> .withColumn("id",f.split(f.reverse(f.split(f.input_file_name(),'/'))[0],'\.')[0])`
> but I don't see how can I do the same with Flink.
>
> Apparently there is [FLIP-107|https://cwiki.apache.org/confluence/display/FLINK/FLIP-107%3A+Handling+of+metadata+in+SQL+connectors] which would allow SQL connectors and formats to expose metadata.
>
> So it would be great for the Filesystem SQL connector to expose the path.
> Ideally for me the path could be exposed via a function that read the metadata. So I could write something akin to `SELECT input_file_name(),* FROM table1`
>
>
> [1]: [https://cwiki.apache.org/confluence/display/FLINK/FLIP-107%3A+Handling+of+metadata+in+SQL+connectors]
> [2]: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Can-I-get-the-filename-as-a-column-td39096.html
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