[GitHub] [arrow] jorgecarleitao commented on issue #8217: How to transform the Arrow data column to array of array efficiently?

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jorgecarleitao commented on issue #8217:
URL: https://github.com/apache/arrow/issues/8217#issuecomment-695783084


   Hi @Zarca,
   
   1. In any particular language?
   2. Arrow is a columnar format. Thus, it is already formatted like you wrote. If you mean is the transpose (i.e. `array[i]` corresponds to an array on which entry is the value of a column), then AFAIK there is no way without a scan i.e. 
   
   
   ```
   for row in rows {
       for column in table.columns() {
              value = column[row]
       }
   }
   ```
   
   as, like I mentioned, Arrow memory alignment is at the column level, no row level.


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