How to filter by the size of keys()
RemHero opened this issue · comments
My requirement is to only find the sequence that contains the exact tag.
For example, there are two sequences, seriesA {t1=v1}, and seriesB {t1=v1 and t2=v2}. Now I want to use an expression to find sequences that only contain {t1=v1}, that is, seriesA, without finding seriesB. I found that using ordinary filter statements cannot meet the requirements, so I want to implement it through the keys () statement, which means that I filter out redundant sequences by judging the length of keys (). How should I write query expressions?
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I am also interested in this!
@RemHero @LarsStegman You should be able to do this with just normal filter expressions:
from(bucket: "example-bucket")
|> range(start: -1d)
|> filter(fn: (r) => r.t1 == "v1" and not r.t2 == "v2")That does not do what we want. What if there is a third tag that we do not know the name of? We cannot write a filter for it, so we need to specify some way that we want exactly the tags we describe and no others.
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Not solved I think
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