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Implement diff derived measure (like div) #1

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kstep opened this issue Jan 19, 2015 · 0 comments
Open

Implement diff derived measure (like div) #1

kstep opened this issue Jan 19, 2015 · 0 comments

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@kstep
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kstep commented Jan 19, 2015

Sometimes it's useful to take difference between dimensions instead of division (e.g. 1st query for "deposits", 2nd query for "withdrawals", and then join them with "leftJoin" and produce "balance" measure of type "derived" with operation "diff" between sum of deposit amount and sum of withdrawal amount).

(I have implementation for the feature, actually, but I'm not sure if I have rights to publish it here, so I propose you to implement it independently, so it won't hurt anybody's (copy)rights. The implementation is trivial anyway =)
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@kstep