Fix bug #3749: if there were several indexs that made an automatically generated FOREIGN KEY index redundant, then MySQL miscalculated the number of keys, and the AUTO_INCREMENT flag was forgotten by MySQL from a PRIMARY KEY. There were probably a multitude of other errors caused by this.


sql/sql_table.cc:
  Fix bug #3749: if there were several indexs that made an automatically generated FOREIGN KEY index redundant, then MySQL miscalculated the number of keys, and the AUTO_INCREMENT flag was forgotten by MySQL from a PRIMARY KEY. There were probably a multitude of other errors caused by this.