engine: fix range query duplicate label handling #402
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fpetkovski
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Jan 14, 2024
engine/engine_test.go
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| @@ -144,6 +144,13 @@ func TestQueriesAgainstOldEngine(t *testing.T) { | |||
| (http_requests_total < 2*http_requests_total) | |||
| )`, | |||
| }, | |||
| { | |||
| name: "duplicate label - top level presentation", | |||
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Can we extend the description with what the expected result here is?
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Added a slightly better test name! The underlying issue is that we would return something like
{} =>
a @ [0]
b @ [3000]
{} =>
c @ [6000]
d @ [9000]
on main since the results appear in different series slots at different times
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Prometheus seems to care about duplicate samples for label only during the same timestamp. Since our operators might return samples for one result in two different series we need to merge them to one result again. Signed-off-by: Michael Hoffmann <mhoffm@posteo.de>
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I would recommend that we do the mapping between different series IDs in the dedup checking operator. This way two series with the same ID would get mapped to a single ID and we will not break the operator contract. |
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Prometheus seems to care about duplicate samples for label only during the same timestamp. Since our operators might return samples for one result in two different series we need to merge them to one result again.