When executing a command of the following form

LEFT(Description,((LOCATE(',',Description))-1))

I get an Exception like this:

14:31:00,038 WARN [org.teiid.PROCESSOR] (Worker3295_QueryProcessorQueue53347) 5tz38FpQ/WJw TEIID30020 Processing exception for request 5tz38FpQ/WJw.50 'TEIID30328 Unable to evaluate LEFT(sometable.Description, (LOCATE(',', sometable.Description) - 1)): TEIID30384 Error while evaluating function left'. Originally ExpressionEvaluationException 'TEIID30396 Left/Right count -1 is invalid. It must be >= 0.' FunctionMethods.java:758. Enable more detailed logging to see the entire stacktrace.