Database can't be passed explicitly for or/or-join clauses

Datomic Pro
5

Oh I got, thanks for pointing me to understand what is wrong. Actually my main case is to use different databases in OR-clauses but I see doc says: As with rules, *src-vars* are not currently supported within the clauses of *or* , but are supported on the *or* clause as a whole at top level. and I found something on the internet: https://datomic.narkive.com/H6z769jM/multiple-databases-in-or and on the forum: Rules with multiple data sources?

Query I’m interesting is:

(d/q "[
  :find [?user ...] 
  :in $ $someDb
  :where 

(or-join [?user]

  (and
    [$someDb _ :user/name ?externalName1] 
    [$ ?user :user/name.EN ?externalName1]
  )

  (and
      [$someDb _ :user/name ?externalName2] 
      [$ ?user :user/name.EN ?externalName2]
   )  
 )   
 ]" (d/db conn) (d/db conn))

And looks like the only possible way is to rearrange query to:

(d/q "[
      :find [?user ...] 
      :in $ $someDb
      :where 

    [$someDb _ :user/name ?externalName1]
    [$someDb _ :user/name ?externalName2] 

    (or-join [?user]
      [?user :user/name.EN ?externalName1]
      [?user :user/name.ES ?externalName2]
    )  

]" (d/db conn) (d/db conn))

But first case could be more preferable since if first statement from or is true then second part is not executed what is better from performance point