[WIP] Migrate Delta Lake tables to Iceberg #5097
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Work is in progress, but putting this out here for general feedback.
The idea will be to leverage the Delta Standalone library, rather than the DeltaCatalog, to read schema/partitioning/table metadata from the existing Delta Lake table. This simplifies the experience as users won't need to configure both a Delta Lake and Iceberg catalog as well as specify the mapping thereof.
A new action will be created to decouple the code behind this from the existing
migrateaction, which makes lots of assumptions about the incoming/exported catalog and relies on theSparkSessionCatalogto retrieve metadata about the state of the source table.