How to create a pie chart after applying math on column values extracted?

[sjs]

Hey people, my requirement is as such

I have extracted these columns from my data using the query 

my query | rex "filterExecutionTime=(?<FET>[^,]+)" | rex "ddbWriteExecutionTime=(?<ddbET>[^)]+)" | rex "EXECUTION_TIME : (?<totalTime>[^ ms]+)" | eval buildAndTearDowTime=(tonumber(FET)) + (tonumber(ddbET)) |table totalTime FET ddbET buildAndTearDownTime

I want to have buildAndTearDown as totalTime - (FET+ ddbET)

once I have all the three values required (FET, ddbET, buildAndTearDown) I want to put these values in a pie chart.

Another question I have is why is 

This statement 

eval buildAndTearDowTime=(tonumber(FET)) + (tonumber(ddbET))

is giving me null value

Thanks 😊 

[sjs]

OMG, that worked as charm

can I add any legends about the time on to the right side or somewhere because ddbET is so small, it is not visible

[sjs]

Thanks that was so silly of me, could you please help me on the pie chart part too

[bowesmana · Accepted solution]

To make the pie chart, do

| table FET ddbET buildAndTearDownTime
| transpose 0

[bowesmana]

You have spelt buildAndTearDownTime incorrectly

| eval buildAndTearDowTime=(tonumber(FET)) + (tonumber(ddbET)) 

missing n in Down