LabelMatchersToModelMatcher parses promql matchers to model matchers.

NewAggregationOperator creates a new aggregation operator based on the type.

NewBinaryOperator creates a new binary operator based on the type.

NewFunctionExpr creates a new function expr based on the type.

NewSelectorFromMatrix creates a new fetchop.

NewSelectorFromVector creates a new fetchop.

Parse takes a promQL string and converts parses it into a DAG.