kylebarron opened a new issue, #41608:
URL: https://github.com/apache/arrow/issues/41608
### Describe the enhancement requested
In pyarrow, it would be great to have the ability to update Parquet
key-value metadata of an existing `ParquetWriter` instance before closing the
file. For example:
```py
import pyarrow.parquet as pq
with pq.ParquetWriter("output.parquet", schema) as writer:
writer.write_batch(...)
writer.add_key_value_metadata({b"hello": "world"})
```
This is akin to the arrow-rs
[`ArrowWriter::append_key_value_metadata`](https://docs.rs/parquet/latest/parquet/arrow/arrow_writer/struct.ArrowWriter.html#method.append_key_value_metadata),
which lets you mutate an existing writer to add key-value metadata before
writing the final metadata.
My use case for this is in writing to GeoParquet efficiently.
### Component(s)
Python
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