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Connect as another user (using a privileged one)

CREATE USER proxy1 IDENTIFIED BY proxy1;
ALTER USER main_user GRANT CONNECT through proxy1;
CONNECT proxy1[main_user]/proxy1@SID;

Now we are connected, let's check current user:

SHOW USER;

Output: user is main_user

If you want to change only the default schema:

ALTER SESSION SET current_schema=other_schema_name