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When will open source v3 come out? It's supposed to be in Apache Iceberg 1.10, right?

Yes 1.10 version will be first version for V3 spec. But not all features are implemented on runners such as Spark or Flink.

I thought 1.9.0 already had at least some of the v3 features, like the variant type and column lineages? https://iceberg.apache.org/releases/#190-release

Of course I haven't seen any implementations supporting these yet.

Yes, the specification will be finalized with version 1.10. Previous versions also include specification changes. Iceberg's implementation of V3 occurs in three stages: Specification Change, Core Implementation, and Spark/Flink Implementation.

So far only Variant is supported in Spark and with 1.10 Spark will support nano timestamp and unknowntype I believe.

Any idea when 1.10 will be released?

I believe we are very close to release candidate. We are waiting unknown type support for Apache Spark per latest email

https://lists.apache.org/thread/gd5smyln3v6k4b790t5d1vy4483m...

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