Optimize empty filter queries. #1810
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…oesn't contains a filter. The query is not really rewritten and the stringer func still returns the correct original query. However the `Filter` func of the `Expr` returns nil which what is being checked when splitting queries in the frontend and also what is being used in the memchunk. see https://github.com/grafana/loki/blob/master/pkg/querier/queryrange/roundtrip.go#L81 and https://github.com/grafana/loki/blob/master/pkg/chunkenc/memchunk.go#L614 Fixes grafana#1792 Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
owen-d
requested changes
Mar 17, 2020
Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
owen-d
approved these changes
Mar 17, 2020
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Optimize filter queries such as
{label="foo"} |~ "" |~ ".*" |= ""doesn't contains a filter.The query is not really rewritten and the stringer func still returns the correct original query.
However the
Filterfunc of theExprreturns nil which what is being checked when splitting queries in the frontend and also what is being used in the memchunk.see https://github.com/grafana/loki/blob/master/pkg/querier/queryrange/roundtrip.go#L81 and https://github.com/grafana/loki/blob/master/pkg/chunkenc/memchunk.go#L614
Fixes #1792
Signed-off-by: Cyril Tovena cyril.tovena@gmail.com