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PromQL parser: fastpath for non-empty matchers and metric name (#8345)

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Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
This commit is contained in:
Julien Pivotto 2021-01-07 11:38:38 +01:00 committed by GitHub
parent 2df1a482da
commit 34656bbf8e
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 11 deletions
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26
promql/parser/parse.go
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@ -583,6 +583,21 @@ func (p *parser) checkAST(node Node) (typ ValueType) {
p.checkAST(n.VectorSelector)
case *VectorSelector:
if n.Name != "" {
// In this case the last LabelMatcher is checking for the metric name
// set outside the braces. This checks if the name has already been set
// previously.
for _, m := range n.LabelMatchers[0 : len(n.LabelMatchers)-1] {
if m != nil && m.Name == labels.MetricName {
p.addParseErrf(n.PositionRange(), "metric name must not be set twice: %q or %q", n.Name, m.Value)
}
}
// Skip the check for non-empty matchers because an explicit
// metric name is a non-empty matcher.
break
}
// A Vector selector must contain at least one non-empty matcher to prevent
// implicit selection of all metrics (e.g. by a typo).
notEmpty := false
@ -596,17 +611,6 @@ func (p *parser) checkAST(node Node) (typ ValueType) {
p.addParseErrf(n.PositionRange(), "vector selector must contain at least one non-empty matcher")
}
if n.Name != "" {
// In this case the last LabelMatcher is checking for the metric name
// set outside the braces. This checks if the name has already been set
// previously
for _, m := range n.LabelMatchers[0 : len(n.LabelMatchers)-1] {
if m != nil && m.Name == labels.MetricName {
p.addParseErrf(n.PositionRange(), "metric name must not be set twice: %q or %q", n.Name, m.Value)
}
}
}
case *NumberLiteral, *StringLiteral:
// Nothing to do for terminals.