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the underlying data format is parquet. parquet is immutable so if one of the parquet files has to be changed, a new version of that file is created (and the old one is kept for a while). The transaction log keeps track on what file is the current one.
the underlying data format is parquet. parquet is immutable so if one of the parquet files has to be changed, a new version of that file is created (and the old one is kept for a while). The transaction log keeps track on what file is the current one.
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