CreateDb fails if currentSchema of the main connection is defined

[IskandarovRost]

Environment

• Platform version: 7.2-snapshot
• PostgreSQL 12

Description of the bug or enhancement

• Minimal reproducible example

1) Database and Scheme with the required names were not created before 2) Setup the createDB task as follows

    task createDb(dependsOn: assembleDbScripts, description: 'Creates local database', type: CubaDbCreation) {
        dbms = 'postgres'
        host = 'localhost'
        dbName = 'schematest123'
        dbUser = 'cuba'
        dbPassword = 'cuba'
        connectionParams = '?currentSchema=cuba_schema'
    }

3) Launch Create Database 4) Launch Create Database once again 5) Manually create "cuba_schema" in the desired database 7) Remove the "cuba_schema" from "postgres" DB 6) Launch Create Database once again

• Expected behavior See https://doc.cuba-platform.com/manual-7.2/db_schema_connection.html The documentation does not say that the custom schema is going to be created. Do not know what to do.

• Actual behavior The problem is that the database(with the manually created schema) is dropped before creation. And... At the first attempt to create the database: cuba_schema is created in the "postgres" database

And the following error occurs

> Task :app-core:createDb FAILED
Using database URL: jdbc:postgresql://localhost/schematest123?currentSchema=cuba_schema, user: cuba
Failed to execute: create table SYS_DB_CHANGELOG (
SCRIPT_NAME varchar(300) not null primary key, 
CREATE_TS timestamp default current_timestamp, 
IS_INIT integer default 0) because: ERROR: no schema has been selected to create in
  �������: 14

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app-core:createDb'.
> java.lang.RuntimeException (no error message)

And after the second attempt:

> Task :app-core:createDb FAILED
[CubaDbCreation] Failed to execute SQL: create schema "cuba_schema";
Error: ERROR: schema "cuba_schema" already exists

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app-core:createDb'.
> [CubaDbCreation] Failed to create Postgres scheme

[IskandarovRost]

Try to connect MSSQL as main datastore like described in https://doc.cuba-platform.com/manual-7.2/db_schema_connection.html And launch CreateDb AR: CreateDb drops the database. Then if "JohnDoe" was made DB_Creator and DB_owner, the tables are created in DBO schema

[IskandarovRost]

1) PostgreSQL is used 2) No database was created before 3) Define the new database name and 'currentSchema' in connection parameters 4) Launch createDb

5) UpdateDb also fails

Please, also note that when the connection params are application-defined "schema" could be set as separate params for Hikari, (but not sure Studio handles it): https://youtrack.cuba-platform.com/issue/STUDIO-7578

[IskandarovRost]

The last problem occurred due to the MixCase schema name. Use double quoting and it works OK: