Hello ,
I am trying to get a sum result between 2 pdu’s using transform function binary operation but it does not work . Here is the input 
Querry A:
SELECT last(“ActivePower”) / 1000 FROM “pdu.snmp” WHERE (“PDU_Name” =~ /^PDU_A/) AND $timeFilter GROUP BY time(1s) fill(null)
Querry B:
SELECT last(“ActivePower”) / 1000 FROM “pdu.snmp” WHERE (“PDU_Name” =~ /^PDU_B/) AND $timeFilter GROUP BY time(1s) fill(null)
Expected result is SUM(A+B) .
Actual result is 0 .
Anybody knows what might be wrong