Nov 4 (Reuters) - Canada’s main stock index hit a record high at open on Thursday, helped by gains in energy and mining shares, while upbeat earnings from Canadian Natural Resources and encouraging economic data further lifted sentiment. At 9:32 a.m. ET (13:32 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 80.71 points, or 0.38%, at 21,345.81. (Reporting by Amal S in Bengaluru; Editing by Anil D’Silva)