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chore: note that tpcds native gen is in preview due to it being significantly slower than parquet gen - #108
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…y slower than parquet until upstream support multi-core/threads
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TPCDS native gen on 64 cores takes > 7 hours. This is dependent on this PR for improvement: datafusion-contrib/tpcgen-rs#389
Making as preview since the native gen is 45x slower than parquet gen.