I/O: Apache Iceberg (backlog)

Author: amotl

doc/backlog/index.md

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 main
 info
+io
 cfr
 ```

doc/backlog/io.md

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+# Backlog for `ctk {load,save} [table]`
+
+## Apache Iceberg
+
+- Exercise access with Iceberg REST catalogs
+  https://altinity.com/blog/introducing-altinity-ice-a-simple-toolset-for-iceberg-rest-catalogs
+
+- Exercise end-to-end integration with e.g. Google Cloud
+  https://opensource.googleblog.com/2026/01/explore-public-datasets-with-apache-iceberg-and-biglake.html
+  https://cloud.google.com/blog/products/data-analytics/announcing-bigquery-tables-for-apache-iceberg
+
+- Verify on Windows
+  Example: `--conf spark.sql.catalog.my_catalog.warehouse=file:///D:/sparksetup/iceberg/spark_warehouse`
+  https://medium.com/itversity/iceberg-catalogs-a-guide-for-data-engineers-a6190c7bf381
+
+- Compression!
+
+- Auth!
+  https://github.com/apache/iceberg/issues/13550