I am pushing now, because :

* I have a fix for crashing bug
* Sanja will destroy my changes in sub-select test ... ;)


mysql-test/r/derived.result:
  tests for recent bugs
mysql-test/r/subselect.result:
  tests for recent bugs
mysql-test/t/derived.test:
  tests for recent bugs
mysql-test/t/subselect.test:
  tests for recent bugs
sql/sql_derived.cc:
  Luckily, we have `make test` so that my last changes could be re-checked