Do i submit pension from Poland as a pension income exempt under a tax treaty or other pension income ?

You can look at the tax treaty between Poland & Canada or check with someone who is knowledgeable in this area to see whether your pension is exempt: https://www.fin.gc.ca/treaties-conventions/poland-pologne-eng.asp 

The CRA may also be able answer you question. If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are somewhere else you can call 613-940-8495. Here are more ways to contact the CRA: https://www.canada.ca/en/revenue-agency/corporate/contact-information/telephone-numbers.html