: Is it possible to do date math in a FunctionQuery? This doesn't work, but I'm
: looking for something like:
:
: bf=recip((NOW-updated),1,200,10) when using DisMax to get the elapsed time
: between NOW and when the document was updated (where updated is a Date field).
"Date Math" (as implemented by the DateMathParser) only deals with
rounding or adding intervals to dates -- not computing differneces between
dates. The key distinction being that DateMath expressions all evaluate
to real dates, what you are descrbing owuld evaluate to a date interval
(ie: a number)
I imagine what you are describing could be implmeneted as a new type of
ValueSource that took in two date fields and a unit (ie: month, day, year,
etc...) and returned the difference between those dates as a numeric valud
of those units. An alternate form could take in a date math expression as
a string in place of one date field so you could compute the difference
beteween a field and a fixed value.
...but that doesn't exist yet.
-Hoss
