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We need JSON serialization/deserialization for Iceberg expressions to support predicate push‑down and…

We need JSON serialization/deserialization for Iceberg expressions to support predicate push‑down and…: a task in LegoFlow-SWE (Harbor dataset). The format should follow the Iceberg specification, covering all expression types.

The task

The format should follow the Iceberg specification, covering all expression types.

Part of Lego-X/LegoFlow-SWE.