@Override
    public String toString() {
        return new StringJoiner(", ", ExtensionMethod.class.getSimpleName() + "[", "]")
            .add("type=" + type)
            .add("method=" + method)
            .toString();
    }
Returns the method invoked.

@return the method invoked.
core/src/main/java/org/jdbi/v3/core/extension/ExtensionMethod.java