Unable to store result of unionall in let query variable

[creisle]

OrientDB Version: 3.0.20

Java Version

openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)

OS: centos07

Expected behavior

Using the demodb I expected the following queries to both return the same result

select expand($d) 
  let $a = (select * from Countries where Name like 'A%'), 
       $b = (select * from Countries where Name like 'B%'), 
       $c = UNIONALL($a, $b), 
       $d = (select * from (select expand($c)) where Name like '%a');

select expand($d) 
  let $a = (select * from Countries where Name like 'A%'), 
       $b = (select * from Countries where Name like 'B%'), 
       $d = (select * from (select expand(UNIONALL($a, $b))) where Name like '%a');

Actual behavior

The first query returns nothing, The second query returns the expected 18 records

Steps to reproduce

Run the queries outlined above

[creisle]

Note that this used to work in v2

[luigidellaquila]

Hi @creisle

I have a fix for this, I'm pushing it to 3.0.x and develop branches now

Thanks

Luigi