Add bool type

[masaoliou]

No description provided.

[dreaming-augustin]

Thank you!

I will arrange some time to review the patch and see what I can do on the MySQL side.

The first thing I notice is that the following comments should be removed everywhere:
// Added by CN.

[dreaming-augustin]

@masaoliou
First, I am certain that you are much more competent and experienced than I am, so thank you for your understanding and patience with me. ;) I am here not because of my skills but simply because I volunteered.

If I understand correctly, your branch contains two major changes:
1- Add bool type,
2- enable PostgreSQL connection to listen on NOTIFY
The first one I understand easily, the second one I am not sure.

Is there a particular reason why you moved everything in drivers/postgres_backend.cpp to cppdb/postgres_backend.h?

We can get a better view of the changes made with the following command (adjust according to your local remotes layout):
$ git diff :drivers/postgres_backend.cpp masaoliou/master:cppdb/postgres_backend.h

[dreaming-augustin]

The pull request is uncommitable as it is.
Implementations for all drivers are missing.

I am trying to have a go at implementing the bool type.
So far there is only the interface; the actual implementation is missing:
https://github.com/artyom-beilis/cppdb/tree/bool-type

[masaoliou]

The pull request is uncommitable as it is. Implementations for all drivers are missing.

This fork supports only PostgreSQL. g++10.2.1 compiles.
All other drivers are removed.