Hello Michael,
there seems to be an issue with the box brackets...
from what i understand from your code
var_out = CE_PROJECTION(:all_users, ["ID" AS "Id",
"NAME" AS "Name",
"UUID" AS "Uuid",
"TYPE" AS "Type",
"USER_ID" AS "UserId"],
'"UserId"=:session_user_var');
Note: i have not tried this specific code out out but have a look in the example on (quoted below) help.sap.com/hana/SAP_HANA_SQL_Script_Reference_en.pdf pg 95.
ot_books1 = CE_PROJECTION (:it_books,["TITLE","PRICE", "CRCY" AS "CURRENCY"], '"PRICE" > 50');
Warm regards
aadi
p.s. the statement 'See CE_CALC for the filter expression syntax' on pg 94 is only for valid syntax you need not use CE_CALC