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some refactor to make PostingsForMatchers more readable (#5897) 

Signed-off-by: YaoZengzeng <yaozengzeng@zju.edu.cn>
pull/6024/head
Yao Zengzeng 2019-09-13 23:10:35 +08:00 committed by Brian Brazil
parent ca424695a6
commit d1f21552b9
1 changed files with 4 additions and 3 deletions
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7
tsdb/querier.go
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@ -328,6 +328,7 @@ func findSetMatches(pattern string) []string {
func PostingsForMatchers(ix IndexReader, ms ...labels.Matcher) (index.Postings, error) {
var its, notIts []index.Postings
// See which label must be non-empty.
// Optimization for case like {l=~".", l!="1"}.
labelMustBeSet := make(map[string]bool, len(ms))
for _, m := range ms {
if !m.Matches("") {
@ -336,9 +337,9 @@ func PostingsForMatchers(ix IndexReader, ms ...labels.Matcher) (index.Postings,
}
for _, m := range ms {
matchesEmpty := m.Matches("")
if labelMustBeSet[m.Name()] || !matchesEmpty {
if labelMustBeSet[m.Name()] {
// If this matcher must be non-empty, we can be smarter.
matchesEmpty := m.Matches("")
nm, isNot := m.(*labels.NotMatcher)
if isNot && matchesEmpty { // l!="foo"
// If the label can't be empty and is a Not and the inner matcher
@ -444,7 +445,7 @@ func postingsForMatcher(ix IndexReader, m labels.Matcher) (index.Postings, error
return index.Merge(rit...), nil
}
// inversePostingsForMatcher eeturns the postings for the series with the label name set but not matching the matcher.
// inversePostingsForMatcher returns the postings for the series with the label name set but not matching the matcher.
func inversePostingsForMatcher(ix IndexReader, m labels.Matcher) (index.Postings, error) {
tpls, err := ix.LabelValues(m.Name())
if err != nil {