ESQL: union types with FORK leaks internal attributes in the output #133973
Description
Description
FROM apps, apps_short | EVAL x = id::integer | FORK (WHERE true) (WHERE true)
results in
id | name | version |$$id$converted_to$integer| x | _fork
---------------+---------------+---------------+-------------------------+---------------+---------------
null |aaaaa |1 |1 |1 |fork1
null |bbbbb |2.1 |2 |2 |fork1
null |ccccc |2.3.4 |3 |3 |fork1
...........
The important bit here is that the two ids from the two indices come from "incompatible" data types (integer and short) even if short should be regarded as perfectly convertible to an integer.