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https://dataframes.bigquery.dev/reference/api/bigframes.bigquery.array_first_n.html
bigframes.bigquery.array_first_n
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bigframes.bigquery.array_first_n(input_array: Series | Expression | Any | Literal[Sentinel.ARGUMENT_DEFAULT], n: Series | Expression | Literal[Sentinel.ARGUMENT_DEFAULT] | int) → Series | Expression[source]
Returns a prefix of input_array consisting of the first n elements.