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* app/vmselect: ignore empty series for `limit_offset`
VictoriaMetrics doesn't return empty series (with all NaN values) to
the user. But such series are filtered after transform functions.
It means `limit_offset` will account for empty series as well.
For example, let's consider following data set:
```
time series:
foo{label="1"} NaN, NaN, NaN, NaN // empty series
foo{label="2"} 1, 2, 3, 4
foo{label="3"} 4, 3, 2, 1
```
When user requests all series for metric `foo` the empty series
will be filtered out:
```
/query=foo:
foo{label="v2"} 1, 2, 3, 4
foo{label="v3"} 4, 3, 2, 1
```
But `limit_offset(1, 1, foo)` is applied to original series, not filtered yet.
So it will return `foo{label="v2"}` (skips the first in list)
```
/query=limit_offset(1, 1, foo):
foo{label="v2"} 1, 2, 3, 4
```
Expected result would be to apply `limit_offset` to already filtered list,
so in result we receive `foo{label="v3"}`:
```
/query=limit_offset(1, 1, foo):
foo{label="v3"} 4, 3, 2, 1
```
The change does exactly that - filters empty series before applying `limit_offset`.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* app/vmselect: ignore empty series for `limit_offset`
Signed-off-by: hagen1778 <roman@victoriametrics.com>
Signed-off-by: hagen1778 <roman@victoriametrics.com>
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| .. | ||
| active_queries.go | ||
| aggr_incremental_test.go | ||
| aggr_incremental.go | ||
| aggr_test.go | ||
| aggr.go | ||
| binary_op.go | ||
| eval_test.go | ||
| eval.go | ||
| exec_test.go | ||
| exec.go | ||
| memory_limiter_test.go | ||
| memory_limiter.go | ||
| parser.go | ||
| rollup_result_cache_test.go | ||
| rollup_result_cache.go | ||
| rollup_test.go | ||
| rollup_timing_test.go | ||
| rollup.go | ||
| timeseries_test.go | ||
| timeseries.go | ||
| transform_test.go | ||
| transform.go | ||
| tzdata.go | ||