2025-07-31 kernel meeting notes

[zachschuermann]

Summary

0.14.0 coming soon - delayed slightly. but will have append FFI, Table API removal, etc.

current PRs

• HDFS (check with tyler) removal
• bunch of timestamp work from @OussamaSaoudi

POC/waiting PRs

• CREATE TABLE (zach)
• Crate split (deprio)
• catalogManaged reads

upcoming

• zach: metrics
• need row id's (re-introduce predicate pushdown)
• @hntd187 targeting CDF reads, need timestamp work
• stats for writes (doing simple non-default engine for now): per-table write metadata schema
• CRC P+M optimization on reads
• kyjah: ask for SHALLOW CLONE in kernel - size/scope?
• prefactor: remove a scan-wide physical schema and push down to something that can access parquet footer
• remove execute, do default engine execute
• robert: working on support for multiple object stores?
• zach: prioritize DAT more?
• zach: FileIO/Evaluation split
  • nick/ryan: we could colocate EvaluationHandler stuff as a CPU-bound zone (and FileIO layer all IO-bound/blocking)
  • maybe call out: EngineData should be in memory
• Look into exception unwind from foreign code
• do we need to update protocol for resolving field ids? in col mapping id mode?
• @rtyler fixed delta-rs checkpoint issue (follow up to check on our side)

Attendees

@zachschuermann @joonyoo181 @OussamaSaoudi

notes stream

• kernel side follow up: to check on checkpoint data iterator shouldn't return batches with different schemas #1099
• @roeap log replay take 3! follow up.
• follow up on Urls discussion from last time.