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-= Adding functions
-
-== Scalar Functions
-
-Scalar functions are data transformers.
-
-[source,cpp]
-----
-include::../example/tutorial.cpp[tag=to_upper]
-----
-<1> The context is optional, and can be used to share between invocations, within the same query or to set errors/return values.
-<2> Let this function take 1 parameter. If this is `span::extent` it will be any size. Functions can be overloaded by the number of parameters.
-<3> Any exception will be turned into an sqlite-error code.
-<4> The function is determistic, i.e. it has no side effects (see https://www.sqlite.org/c3ref/c_deterministic.html[Function Flags])
-
-The return type `T` of the function gets transformed into an sqlite value by using a `tag_invoke` overload.
-This interface is public and meant to be extended.
-
-[source,cpp]
-----
-void tag_invoke(set_result_tag, sqlite3_context * ctx, T);
-----
-
-The builtin types are:
-
-- `blob`
-- `zero_blob`
-- `double`
-- `std::int64_t`
-- `nullptr`
-- `string_view`
-- `std::string`
-- `sqlite::value`
-- `variant2::monostate`
-- `error`
-- `std::unique_ptr<T>` (see the https://www.sqlite.org/bindptr.html[pointer passing interface])
-- `variant2::variant<Ts...>` if all `Ts` are supported
-- `result<T>`
-- `boost::json::value` //when including boost/sqlite/json.hpp
-
-The translation of the exceptions happens as follows:
-
-[cols="1,1"]
-|===
-| Type | Sqlite error code
-
-| `boost::system::system_error` | `.code()`
-| `std::bad_alloc`              | SQLITE_NOMEM
-| `std::length_error`           | SQLITE_TOOBIG
-| `std::out_of_range`           | SQLITE_RANGE
-| `std::logic_error`            | SQLITE_MISUSE
-| `...`                         | SQLITE_ERROR
-
-|===
-
-NOTE: You can also return an <<`result`,sqlite::result>> type instead of throwing exceptions.
-
-== A ggregate functions
-
-An aggregate function builds a value from multiple values of the same column, e.g:
-
-[source,sqlite]
-----
-select avg(age) from users ;
-----
-
-`avg` is a built-in function, but
-Below is a toy example. We count how many retirees are among the users, based on a retirement age.
-
-[source,cpp]
-----
-include::../example/tutorial.cpp[tag=oldest]
-----
-
-The `retirees` object will be constructed for every query it's used in, and the parameters passed witht he `make_tuple`
-will be passed to the constructor.
-The `step` will be called for every value and `final` at the end when the query has ended and a value is required.
-
-The value types & exceptions are the same as for the scalar function.
-
-== Window functions
-
-Window functions look similar to aggregate functions, they only need an `inverse` function, that shares the signature with `step`.
-
-It is recommended to consult the https://www.sqlite.org/windowfunctions.html[sqlite window function documentation].
-
-NOTE: Window functions are only available for sqlite 3.25.0 and higher.
-