Compile converts an input stream into the corresponding Expression.

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.

CompileOptions allows for specifying compile options.

The Engine for running queries.

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

ASTNode 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.