DoumanAsh opened a new pull request, #19262:
URL: https://github.com/apache/datafusion/pull/19262
## Which issue does this PR close?
- Closes #19261
## Rationale for this change
As per issue, this is most simple approach to allow user to have control
over file outputs when writing partitioned parquet/csv
I'm not certain if it would be useful for `part-{idx}` or not as I do not
understand code base well enough to see context of where it is used (for my
part I'm mostly interested in making sure randomised file names have unique
prefix that I can use to identify these files)
## What changes are included in this PR?
Introduces new option `partitioned_file_prefix_name` within
`ExecutionOptions` with default value empty to retain current behavior by
default
This option is used to generate prefix of the file name in writes of
`datasource`' and `datasource-*` crates
## Are these changes tested?
I included basic test to illustrate behaviour of partitioned file output
## Are there any user-facing changes?
These changes do not change existing behaviour
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