ExtractFetchExpressions extracts timeseries fetch expressions from the given query.

MustRegisterAliasedFunction registers a function under an alias, issuing a panic if the function cannot be registered.

MustRegisterFunction registers a function, issuing a panic if the function cannot be registered.

NewEngine creates a new query engine.

The Engine for running queries.

Function contains a function to invoke along with metadata about the function's argument and return type.

ArgumentASTNode is an interface to help with printing the AST.

CallASTNode is an interface to help with printing the AST.

An Expression is a metric query expression.