numbers, which uses "X.YeZ" notation when the exponent Z would be
less than -4. That behavior at -4 is not exactly what we want, and
our Decimal type offers smarter number representation.  By changing
profiling to use Decimal types, we get more readable output.


sql/sql_profile.cc:
  Change the DOUBLE I_S types to DECIMAL, so we get a smarter
  floating-point number renderer.
sql/sql_show.cc:
  Add MYSQL_TYPE_DECIMAL as a string-ish type that INFORMATION_SCHEMA
  tables may use.