A zero-overhead view of `text` data from Postgres

TODO: can we avoid this box? The foreign data wrapper itself. The next() method of this object is responsible for creating row objects to return data.

This represents a row. Because columns can be queried in any order, no expectations can be made about the order to return fields in a row in. Instead,

Contains all the methods for interacting with Postgres at a low level. You should not interact with this directly, instead use `#[pg_foreignwrapper]`

Information for a longjmp

Types that were allocated by Postgres Any data allocated by Postgres or being returned to Postgres for management must be stored in this value.

An allocattor which uses the palloc and pfree functions available from Postgres. This is managed by Postgres and guarantees that all memory is freed

Get the Postgres info for a type

Types which implement this can be converted from pointers to their Rust type and vice versa.

A trait that allows for conversions between Postgres Datum types and Rust types. Only Sized types, that fit in a single Datum, bool, u8 - u64 e.g. No