InfluxQL: Impact of functions on query perf

InfluxDB 2
,
1

DB: Influx2.7
Language: InfluxQL

Hi Team,

Can you please help me understand from a technical point of view, what the impact of using EXP() and CUMULATIVE_SUM() is in InfluxQL

  1. Query without functions:
    select field from measurement where time > now()-7d

  2. Query with functions:
    select EXP(CUMULATIVE_SUM(field)) from measurement where time > now()-7d

What happens under the hood when using EXP() and CUMULATIVE_SUM() here and what’s the impact on query performance?

cc: @Anaisdg, @Jay_Clifford, @scott tagging for attention please :pray: