First of all, look up interval laterals in the SQL standard and find out 
whether it's even valid. 

Julian

> On Oct 22, 2015, at 21:49, Hsuan Yi Chu <[email protected]> wrote:
> 
> Hi All,
> I am trying to resolve CALCITE-922, (interval error, coming from attempting
> to get value of Interval Type).
> 
> However, I found another issue regarding the "sign (i.e., + or -)" of
> Interval type (see CALCITE-928). To resolve it, can somebody tell me what
> this means:
> 
> "INTERVAL -'-1' YEAR"
> 
> Do the two negative signs cancel each other?

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