This seems to be a bug in Oracle that comes and go.
Found an old entry from 2012 on stackOverflow that reads: “…Looking around on the net I find this was reported as a bug at various times in Oracle versions 8 and 9 - perhaps it has crept back into 11.2”
Nope, just i'm trying to avoid sending complex ORACLE queries directly from QLIK. I realized that is better to build a warehouse database, so i made all queries tables. What it is for me still a question is why this started to happen last 2,3 months, propably after an update on QLik sense platform