So I got this to work with a different query using eval().
Is this the right way to do this?
String query = "select key, received as previous, $temp[0].current as
current, $temp[0].delta as delta from Activity, let $temp = (select
received as current, eval('received - $parent.current.received') as delta
from Activity where ($parent.current.key = key) and (time >
$parent.current.time) order by time limit 1)";
And the output:
#-2:1{key:wsbroker1,previous:100,current:120,delta:20} v0
#-2:2{key:wsbroker1,previous:120,current:130,delta:10} v0
#-2:3{key:wsbroker1,previous:130,current:150,delta:20} v0
#-2:4{key:wsbroker1,previous:150,current:190,delta:40} v0
#-2:5{key:wsbroker1,previous:190} v0
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