when they contain the '!' operator.
Added an implementation for the method Item_func_not::print. 
The method encloses any NOT expression into extra parentheses to avoid
incorrect stored representations of views that use the '!' operators.
Without this change when a view was created that contained
the expression !0*5  its stored representation contained not this
expression but rather the expression not(0)*5 . 
The operator '!' is of a higher precedence than '*', while NOT is 
of a lower precedence than '*'. That's why the expression !0*5 
is interpreted as not(0)*5, while the expression not(0)*5 is interpreted
as not((0)*5) unless sql_mode is set to HIGH_NOT_PRECEDENCE.
Now we translate !0*5 into (not(0))*5. 


mysql-test/r/sp-code.result:
  Adjusted results after the fix of bug 25580.
mysql-test/r/subselect.result:
  Adjusted results after the fix of bug 25580.
mysql-test/r/view.result:
  Added a test case for bug #25580.
mysql-test/t/view.test:
  Added a test case for bug #25580.
sql/item_cmpfunc.cc:
  Fixed bug #25580: incorrect stored representations of views in cases
  when they contain the '!' operator.
  Added an implementation for the method Item_func_not::print. 
  The method encloses the NOT expression into extra parenthesis to avoid
  incorrect stored representations of views that use the '!' operators.
sql/item_cmpfunc.h:
  Fixed bug #25580: incorrect stored representations of views in cases
  when they contain the '!' operator.
  Added an implementation for the method Item_func_not::print. 
  The method encloses the NOT expression into extra parenthesis to avoid
  incorrect stored representations of views that use the '!' operators.