postgres: search w multiple values causes error SQLite only supports single value arguments

[patricebender]

we get a sqlite specific error message for a search in postgres with multiple arguments.

---

In e.g. a bookshop, fire up a cds r --profile pg session:

❯ cds r --profile pg
Welcome to cds repl v7.3.0
> var { server } = cds.test()
> [cds] - loaded model from 5 file(s):

  srv/user-service.cds
  srv/cat-service.cds
  srv/admin-service.cds
  db/schema.cds
  ../../dev/cds/common.cds

[cds] - connect to db > postgres {
  url: ':memory:',
  host: 'localhost',
  port: 5432,
  user: 'postgres',
  password: '...',
  database: 'postgres'
}

and then:

> query = SELECT`from ${Books} {ID, title}`
Query {
  SELECT: {
    from: { ref: [ 'sap.capire.bookshop.Books' ] },
    columns: [ { ref: [ 'ID' ] }, { ref: [ 'title' ] } ]
  }
}
> query.SELECT.search = [{val: 'Wuthering'}, 'or', {val: 'Emily'}]
[ { val: 'Wuthering' }, 'or', { val: 'Emily' } ]
> await query
Uncaught SQLite only supports single value arguments for $search

[patricebender]

closing because already reported in #127