When SQL is invalid and you press Get answer in the Native query window, no error message is displayed. Metabase only says: “No results! This may be the answer you’re looking for. If not, try removing or changing your filters to make them less specific.”. Sometimes it’s really hard to understand what’s the problem because the same query works in PostgreSQL command line. Metabase should display a detailed error message from PostgreSQL.
Not sure if you also created an issue, but there’s one filed for 0.32.7, which seems to be a release with a couple of hiccups: