Why does the "tstats count" and "tstats values" generate a different event count?

[eugenezxq]

I have 2 queries:
|tstats values(sth.sth) as sth... |stats count by sth | ...

and

|tstats count from datamodel=sth ... | stats count by sth |...

both give me a different event count. Just want to know why that is the case.

[inventsekar]

count(X)

This function returns the number of occurrences of the field X.

values(X)
This function returns the list of all distinct values of the field X as a multi-value entry. The order of the values is lexicographical.

this is from stats command page.. this will be applicable for tstats as well, i think
http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/CommonStatsFunctions

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