The documentation for mvfilter seems to be incorrrect. I get the same error message as the original poster:
Error in 'eval' command: The arguments to the 'mvfilter' function are invalid.
when I use mvfilter like this:
| eval SessionEndTime = mvfilter (SessionEndTime != NULL)
Using null() instead of NULL does not work either; it gives me the error:
Error in 'eval' command: Typechecking failed. The '!=' operator received different types.
What does seem to work is putting NULL in quotes like this:
| eval SessionEndTime = mvfilter (SessionEndTime != "NULL")
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