wgtmac commented on code in PR #242: URL: https://github.com/apache/parquet-format/pull/242#discussion_r1603555087
########## README.md: ########## @@ -113,6 +119,55 @@ chunks they are interested in. The columns chunks should then be read sequentia  +### Parquet 3 + +Parquet 3 files have the following overall structure: + +``` +4-byte magic number "PAR1" +4-byte magic number "PAR3" +8-byte offset of File Metadata v3 +8-byte length of File Metadata v3 Review Comment: +1. Use header to store file-level metadata prohibits streaming write, especially when extending parquet to be appendable. For example, implementations can choose to append new row groups to an existing parquet file by simply generating a new FileMetaData containing both old and new row groups. -- 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]
