To find this out, you can either look at the Canada/Poland treaty here: https://www.canada.ca/en/department-finance/programs/tax-policy/tax-treaties/country/poland-convention-2012.html
Or you can contact the Canada Revenue Agency (CRA) and ask them. If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere you can call 613-940-8495. This page has more ways to contact the CRA: https://www.canada.ca/en/revenue-agency/corporate/contact-information/telephone-numbers.html