How to concatenate arrays grouped by another column in presto?

@rollin 

One way to concatenate arrays grouped by another column in Presto is to use the array_agg function along with the GROUP BY clause. Here is an example query to concatenate arrays grouped by another column:

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SELECT 
  group_column,
  array_agg(array_column) as concatenated_array
FROM 
  your_table
GROUP BY 
  group_column;

In this query:

• your_table is the name of your table.
• group_column is the column you want to group by.
• array_column is the column containing the arrays that you want to concatenate.

This query will group the rows by the group_column and concatenate the arrays from the array_column into a single array for each group.