funcheetah opened a new pull request, #4664: URL: https://github.com/apache/iceberg/pull/4664
### Summary Apache Iceberg does not support non-optional union types (e.g. [“int”, “string”]). This PR add spec to support non-optional union types. ### Representation non-optional union type can be converted to original type for single type union or struct for complex union. The struct representations converted from non-optional union types are consistent with non-optional union support added in Trino in https://github.com/trinodb/trino/pull/3483. Deep nested non-optional union types are supported. #### Examples Basic [“int”, “string”] -> struct<tag int, field0 int, field1 string> Single type [“int”] -> int ### Implementation PRs - https://github.com/apache/iceberg/pull/4242 - https://github.com/apache/iceberg/pull/4654 ### TODO - Handle single type union (e.g. [“int”]) as its original type - Support for schema pruning within a complex union - Support in non-Spark environments (e.g. iceberg-data, flink, hive, etc.) -- 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]
