Table corruption happens during table reading in ha_tina::find_current_row() func.
Field::store() method returns error(true) if stored value is 0.
The fix:
added special case for enum type which correctly processes 0 value.
Additional fix:
INSERT...(default) and INSERT...() have the same behaviour now for enum type.


mysql-test/r/csv.result:
  test result
mysql-test/r/default.result:
  result fix
mysql-test/t/csv.test:
  test case
sql/item.cc:
  Changes:
  do not print warning for 'enum' type if there is no default value.
  set default value.
storage/csv/ha_tina.cc:
  Table corruption happens during table reading in ha_tina::find_current_row() func.
  Field::store() method returns error(true) if stored value is 0.
  The fix:
  added special case for enum type which correctly processes 0 value.