mysql-test/r/type_newdecimal.result:
  Fix for bug #18014: data loss caused by altering decimal fields.
    - test result
mysql-test/t/type_newdecimal.test:
  Fix for bug #18014: data loss caused by altering decimal fields.
    - test case
sql/field.cc:
  Fix for bug #18014: data loss caused by altering decimal fields.
    - Field_new_decimal::is_equal() introduced for proper comparisons of the decimal field definitions.
sql/field.h:
  Fix for bug #18014: data loss caused by altering decimal fields.
    - Field_new_decimal::is_equal() introduced for proper comparisons of the decimal field definitions.