Final answer:
The statement refers to BigQuery automatically converting nested array data into a flat, tabular format in Standard SQL mode, which can affect query results. The operator can be used to manually handle array flattening.
Step-by-step explanation:
The statement mode implicitly flattens arrays" refers to how BigQuery handles arrays within its Standard SQL mode. When you perform a query on a table that contains nested fields, or arrays, BigQuery will automatically "flatten" these arrays. This means it will convert the nested data structure into a flat, tabular format where each element of the array is represented as a separate row in the resulting table.
In BigQuery, arrays are a data type that allows you to store multiple values in a single field. When using BigQuery inarrays are automatically flattened when querying the data.This means that instead of returning an array as a single value, BigQuery will return each element of the array as a separate row in the result set.For example, if you have a table with a column that contains an array of a person's hobbies, querying that column in mode will return a separate row for each hobby, instead of returning the entire array as a single value.