liquidcarbon commented on issue #447: URL: https://github.com/apache/parquet-format/issues/447#issuecomment-2311019015
Hi! I'm confused by different types of metadata. 1) there's key-value metadata of type BLOB that you can write via schema metadata (in python `pyarrow.table(data, metadata=...)`) and read similarly, or through https://duckdb.org/docs/data/parquet/metadata.html#parquet-key-value-metadata 2) there's separate place, with these fields, that you can read with https://duckdb.org/docs/data/parquet/metadata.html#parquet-metadata ``` ['file_name', 'row_group_id', 'row_group_num_rows', 'row_group_num_columns', 'row_group_bytes', 'column_id', 'file_offset', 'num_values', 'path_in_schema', 'type', 'stats_min', 'stats_max', 'stats_null_count', 'stats_distinct_count', 'stats_min_value', 'stats_max_value', 'compression', 'encodings', 'index_page_offset', 'dictionary_page_offset', 'data_page_offset', 'total_compressed_size', 'total_uncompressed_size', 'key_value_metadata'] ``` column-level information and data types are recorded here. But how to you write something into THAT `key_level_metadata` ? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
