Whether series dependon filedKey ?

In the notes of the official document:
**In InfluxDB, a series is a collection of points that share a measurement, tag set, and### field key.**

but when I query SHOW SERIES CARDINALITY ON XX (or query _interval/database/numSerise.)
Seires doesn't seem to depend on the filedKey.

for example
I have 100,1,5,2000 tag set and 2 filedkey numSeries = 100W instead of 200W.

Start by reproducing the reported comparison between the documented series definition and SHOW SERIES CARDINALITY ON XX, using 100,1,5,2000 tag sets with two field keys. Also compare the _interval/database/numSerise result; done means determining whether field keys should affect series cardinality and documenting or correcting the discrepancy.

Written by the indexing model from the issue text.