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app/vmselect/promql: automatically apply offset -step to rollup_candlestick function in order to obtain the expected OHLC results

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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/309
This commit is contained in:
Aliaksandr Valialkin 2020-02-04 23:23:37 +02:00
parent 4f7116d1ee
commit ce38b176bc
1 changed files with 11 additions and 1 deletions
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12
app/vmselect/promql/eval.go
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@ -425,7 +425,7 @@ func evalRollupFunc(ec *EvalConfig, name string, rf rollupFunc, expr metricsql.E
if err != nil {
return nil, err
}
ecNew = newEvalConfig(ec)
ecNew = newEvalConfig(ecNew)
ecNew.Start -= offset
ecNew.End -= offset
if ecNew.MayCache {
@ -435,6 +435,16 @@ func evalRollupFunc(ec *EvalConfig, name string, rf rollupFunc, expr metricsql.E
ecNew.End = end
}
}
if name == "rollup_candlestick" && len(re.Window) == 0 {
// Automatically apply `offset -step` to `rollup_candlestick` function
// in order to obtain expected OHLC results.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/309#issuecomment-582113462
step := ecNew.Step
ecNew = newEvalConfig(ecNew)
ecNew.Start += step
ecNew.End += step
offset -= step
}
var rvs []*timeseries
var err error
if me, ok := re.Expr.(*metricsql.MetricExpr); ok {