What the Iceberg v4 dev list tells us about adaptive metadata trees, single-file commits, column updates, and the format's next chapter in mid-2026.
MCP connects agents to tools; A2A connects agents to each other. A 2026 map of agentic AI standards: MCP, A2A, WebMCP, Apache Ossie (OSI), and agent payments.
Apache Arrow at 10, ADBC, Flight SQL, nanoarrow, the AI reinterpretation, and how an in-memory standard eliminated the copy tax across the data stack.
Apache Parquet in 2026, variant types, geospatial, ALP encoding, footer redesign, the versioning debate, and how the decade-old format is renovating.
