Schemas with views

[fesor]

Q	A
Type	feature
BC Break	no
Fixed issues	Partially #1798

Summary

This PR adds ability to define views using schema manager. This is small rework of #2510

$schema->createView('my_view', 'SELECT * FROM some_table');
if ($schema->hasView('my_view')) {
    $view = $schema->getView('my_view');
    $schema->dropView('my_view');    
}

• Base implementation
• Update docs

[fesor]

@morozov could you review this PR when you will have a little time? At least to set some kind of direction of what should I do next.

[ostrolucky]

You should use parameter and return types everywhere

[ostrolucky]

There are still missing typehints, please go through your PR and add it everywhere. I've seen missing return bool, return void, return self etc. I know ideally CI should tell you to do that, but this rule is not enabled due to old code.

[fesor]

@ostrolucky as far as I can see there is no any return type hints used in code base yet. I will add type hints/return type to methods introduced by me (so there would be no or little conflicts), but I would suggest to add type hints to other methods as part of separate PR.

Also, I could try to use psalm/psalter to automatically update typehints in code base from inferred types

updated: Looks like @morozov already planning to do something like that: vimeo/psalm#1073

[morozov]

@ostrolucky as far as I can see there is no any return type hints used in code base yet. I will add type hints/return type to methods introduced by me (so there would be no or little conflicts), but I would suggest to add type hints to other methods as part of separate PR.

Also, I could try to use psalm/psalter to automatically update typehints in code base from inferred types

updated: Looks like @morozov already planning to do something like that: vimeo/psalm#1073

Please use all possible type hints for new APIs. No need to update existing code. I'm working on these changes against develop since it's a BC break.

[morozov]

@fesor I haven't had a chance to dive deep in the code but on the surface, it all looks good. Please continue to the extent where you consider it code complete and we can get back to it. Or do you have any specific questions?