[11.x] Fix inconsistent database parsing on PostgreSQL

[hafezdivandari]

As explained on #49020, Schema::hasTable() uses Schema::getTables() on all database drivers except PostgreSQL, because Schema::hasTable() on PostgreSQL is the only function on the schema/grammar/builder that accepts 3-parts references like Schema::hasTable('database.schema.table'). This is an inconsistent behavior, as other functions and non of the other database drivers support this syntax.

This PR fixes this by throwing an exception if 3-parts reference is mistakenly passed to Schema::hasTable() and also changes Schema::hasTables() on PostgreSQL to use Schema::getTables() just like other databases.

Note: Passing 2-parts reference or just table name to these functions on PostgreSQL works as expected as before:

Schema::hasTable('schema.table');
Schema::getColumns('schema.table');
Schema::getIndexes('schema.table');
Schema::getForeignKeys('schema.table');
Schema::hasTable('table'); // uses default schema
Schema::getColumns('table'); // uses default schema
Schema::getIndexes('table'); // uses default schema
Schema::getForeignKeys('table'); // uses default schema

Upgrade Guide

Likelihood Of Impact: Very Low

The Schema::hasTable() on PostgreSQL database doesn't accept declaring database name by passing a 3-parts reference anymore and will throw an exception. Therefore, if you were using 3-parts reference on these methods you may use connection() to declare the database instead:

- Schema::hasTable('database.schema.table');
+ Schema::connection('database')->hasTable('schema.table');

[driesvints]

@hafezdivandari are you still working on this?

[hafezdivandari]

@driesvints yes, I'm wating for #49264 to be merged:

https://github.com/laravel/framework/pull/49264/files#diff-9fc77e1263d98fe08a38be1f5d172d2497320915fa8b8148e1823052eb33f403R231

[hafezdivandari]

@driesvints would you please merge '10.x' into master? cc @crynobone

[driesvints]

@hafezdivandari will do as soon as all of the fixes PRs that are open are merged.

[driesvints]

@hafezdivandari done now