HeatWave Release Notes
External tables are non-InnoDB tables which do not store any data, but refer to data stored externally in Object Storage, in the following file formats:
Avro.
CSV.
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JSON.
As of MySQL 8.4.0, Lakehouse supports Newline Delimited JSON.
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Parquet.
The external table stores the location of the data, see Section 5.5, “Access Object Storage”.