1) The memory allocated there later packed into smart pointer with deleter set to mysql_free_result. Can't see how it can be leaked unless something throws in between(at first look I can't actually see what could throw there, but this case should probably be cared about)
2) These are in tests. Put everything in smart ptrs
3) From what I traced - there is no way for it to get past smart ptr. So, maybe testcases. But in testcases everything is seemingly already in smart pointers. This item is most suspicious.
But closing so far, nevertheless. Commit 94abce1