[daisy] [JIRA] Created: (DSY-661) Query language: handle 'null' dates more elegantly

[Karel Vervaeke (JIRA)]

Query language: handle 'null' dates more elegantly
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         Key: DSY-661
         URL: http://issues.cocoondev.org//browse/DSY-661
     Project: Daisy
        Type: Improvement
    Versions: 2.2    
 Reporter: Karel Vervaeke
    Priority: Minor


Currently the repository throws nullpointer exceptions on this query if the date $FooDate is null:

select Year($FooDate) ...

Solution one: Year(null) returns null (same for other date functions)
Solution two: Year(null) returns 0 (same for other date functions)

pro solution one: makes sense
pro solution two: makes sense (but less), allows for nifty date calculations: Year($FooDate) + DayOfYear($fooDate)

Also, a Milliseconds(date) function would be nice.

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