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lib/storage: move composite filters to the top during sorting

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This commit is contained in:
Aliaksandr Valialkin 2021-02-17 20:22:30 +02:00
parent faad6f84a4
commit 939d5ffc2b
1 changed files with 12 additions and 2 deletions
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14
lib/storage/tag_filters.go
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@ -245,9 +245,19 @@ type tagFilter struct {
graphiteReverseSuffix []byte
}
func (tf *tagFilter) isComposite() bool {
k := tf.key
return len(k) > 0 && k[0] == compositeTagKeyPrefix
}
func (tf *tagFilter) Less(other *tagFilter) bool {
// Move regexp and negative filters to the end, since they require scanning
// all the entries for the given label.
// Move composite filters to the top, since they usually match lower number of time series.
// Move regexp filters to the bottom, since they require scanning all the entries for the given label.
isCompositeA := tf.isComposite()
isCompositeB := tf.isComposite()
if isCompositeA != isCompositeB {
return isCompositeA
}
if tf.matchCost != other.matchCost {
return tf.matchCost < other.matchCost
}