bigframes.bigquery.flatten

bigframes.bigquery.flatten(array_to_flatten: Series | Expression | Any | Literal[Sentinel.ARGUMENT_DEFAULT], depth: Series | Expression | Literal[Sentinel.ARGUMENT_DEFAULT] | int = Sentinel.ARGUMENT_DEFAULT) → Series | Expression

Takes an array of nested data and flattens a specific part of it into a single, flat array with the [array elements field access operator][array-el-field-operator]. Returns NULL if the input value is NULL.