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Fix bug with orderBy on duplicate values #713
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…nce the collection will notice they were already in the collection
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There was a bug in
orderBythat could cause duplicate values to be skipped. For example, if we had this data:1, 2, 3, 3, 3, 4, 5. And we would request LIMIT 3 then we would load1, 2, 3and remember that the max value we've loaded is3. Then on the next load request we would ask fordata > 3which would skip over the duplicate values3and immediately return4, 5thereby missing the two other occurences of the value3.This PR modifies
requestLimitedSnapshotsuch that it loads 2 subsets: all the occurences ofmaxValueand all data> maxValue. We can't do it in 1 query which is>= maxValue LIMIT Nbecause the duplicate values would count towards the limit but we may already have loaded some of them. e.g.>= 3 LIMIT 3would give3, 3, 3but we had already seen the first occurence of3, so that's wrong because we actually expect to get3, 3, 4(the next two occurences of 3 and the value4).TODO:
truefromsetWindowinstead of returning the promise of the underlying collection. Need to fix this in a follow up PR and then we can update the unit tests here to useawaitinstead ofsleep().