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並前往https://dankleiman.com/2017/11/07/more-efficient-solutions-to-the-top-n-per-group-problem/

More Efficient Solutions to the Top N per Group Problem - Dan ...

The ARRAY_AGG query takes an row size input of 11.0 M and reduces the output to 19.7K. BigQuery ARRAY_AGG query plan stage 4. In contrast, the ...

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