XiaoHongbo-Hope opened a new issue, #283: URL: https://github.com/apache/paimon-cpp/issues/283
### Motivation Java Paimon stores `MAP<K, BLOB>` columns in dedicated `.blob` files. Paimon C++ should be able to load those schemas and read the existing payload format through the Table API, including data-evolution fallback across sequence layers. ### Reader scope - Decode payload version 1 for BOOL, integer, DATE, STRING, BINARY, and DECIMAL keys. - Support both inline BLOB values and BLOB descriptors. - Preserve null maps, empty maps, null values, and empty values. - Validate payload bounds, duplicate keys, DECIMAL canonical encoding, UTF-8 STRING keys, and non-null map keys required by Arrow. - Resolve placeholders across multiple sequence layers. `paimon.map.selected-keys` is intentionally unsupported for Map Blob reads for now because filtering the internal fallback placeholder would lose older-layer data. `TIME` keys and `ARRAY<BLOB>` are also outside this issue and should be handled separately with their end-to-end type/format support. ### Write support This issue only tracks read compatibility. C++ table creation, regular writes, and append compaction must reject `MAP<K, BLOB>` until a Java-compatible Map Blob writer is implemented. There is no concrete writer timeline yet; writer support should be proposed and tracked separately. Implementation: #278 -- 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]
