atoti.directquery.multi_column_array_conversion module#
- class atoti.MultiColumnArrayConversion#
Convert an external table where the array values are stored with one element per column to a table with arrays.
When a table has at least 2 columns with names following the pattern
prefix + delimiter + number(numbers being consecutive and starting with 0 or 1), all these columns can be converted into a single array column.For instance, given a table where a “Quantity” array is stored with 5 five columns:
PRODUCT
QUANTITY_0
QUANTITY_1
QUANTITY_2
QUANTITY_3
QUANTITY_4
product_1
10
20
15
25
10
product_2
50
65
55
30
80
These columns can be matched with the
"QUANTITY"prefix and it will be converted to a table with an array column:PRODUCT
QUANTITY
product_1
[10,20,15,25,10]
product_2
[50,65,55,30,80]
If several prefixes are passed, a distinct array column will be created for each of them.