wgtmac commented on code in PR #41633:
URL: https://github.com/apache/arrow/pull/41633#discussion_r1615387576
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cpp/src/parquet/arrow/writer.h:
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@@ -143,6 +143,16 @@ class PARQUET_EXPORT FileWriter {
virtual ~FileWriter();
virtual MemoryPool* memory_pool() const = 0;
+ /// \brief Add key-value metadata to the file.
+ /// \param[in] key_value_metadata the metadata to add.
+ /// \note This will overwrite any existing metadata with the same key.
+ /// \return Error if Close() has been called.
+ ///
+ /// WARNING: If `store_schema` is enabled, `ARROW:schema` would be stored
+ /// in the key-value metadata. Overwriting this key would result in
+ /// `store_schema` unusable during read.
Review Comment:
```suggestion
/// undefined behavior of `ARROW:schema` during read.
```
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