Can I convert Parquet data to an Iceberg table without creating a new table?

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No, you cannot convert Parquet data to an Iceberg table without creating a new table. Iceberg file format is designed with metadata management in mind, so creating a new table with proper metadata is required to take full advantage of the Iceberg table features. However, you can use the data from the existing Parquet table as a source to populate the new Iceberg table by reading the data from the Parquet table and writing it to the new Iceberg table.