tinfoil-knight opened a new pull request, #9594:
URL: https://github.com/apache/arrow-datafusion/pull/9594

   ## Which issue does this PR close?
   
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   Closes #9575
   
   ## Rationale for this change
   
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    Why are you proposing this change? If this is already explained clearly in 
the issue then this section is not needed.
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   #9382 standardised write configuration but broke backwards compatibility for 
the format specific options of the `COPY` command.
   
   Earlier users could have a query like this without prefixing all options:
   ```
   COPY source_table TO 'test_files/scratch/copy/format_table/' (
       format parquet,
       compression snappy,
       'compression::col1' 'zstd(5)'
   );
   ```
   
   But after #9382, they'd need to prefix every format-specific options in this 
verbose way:
   
   ```
   COPY source_table TO 'test_files/scratch/copy/format_table/' (
       format parquet,
       'parquet.compression' snappy,
       'parquet.compression::col1' 'zstd(5)'
   );
   ```
   
   This PR adds back the support for format-specific options that worked 
without providing the format prefix.
   
   ## What changes are included in this PR?
   
   <!--
   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
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   This PR renames keys without the file_type/format prefix for file types 
supported by the `COPY` command for backwards compatibility.
   
   ## Are these changes tested?
   
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   1. Prevent the code from being accidentally broken by subsequent changes
   2. Serve as another way to document the expected behavior of the code
   
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   - Existing tests in `copy.slt` confirm that the prefixed format options (eg. 
`(format json, 'json.compression' gzip)`) added in #9382 work & aren't broken.
   - Tests have been added for the legacy format (eg. `(format json, 
compression gzip)`).
   
   ## Are there any user-facing changes?
   
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   If there are user-facing changes then we may require documentation to be 
updated before approving the PR.
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   Yes. But the current documentation 
(https://arrow.apache.org/datafusion/user-guide/sql/write_options.html#available-options)
 lists the legacy format so this PR doesn't require a doc update. 
   
   
   > If there are any breaking changes to public APIs, please add the `api 
change` label.
   
   This PR restores breaking changes so I'm not adding the `api change` label. 
Please let me know if you think we should add the label nonetheless.
   


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