[Mobilitydb-users] check for empty period?

[Wendell Turner]

Hello,

I have some queries that fail with:

    "ERROR:  Period cannot be empty"

How can I check for this?  Is there a 'PERIOD EMPTY' that it could be checked against?  Checking for:
" ... and upper(period(flown_path)) > lower(period(flown_path))"
does not seem to catch the offending element.

Thank you.
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