message: Decimal is a valid numeric type
  * Decimal is a valid numeric type
  This will allow automatic creation of sum__ and avg__ metrics
  * formatting for line length at 80 chars
  * Reformating again, for the mandatory 79 chars maximum.
diff: @@ -168,7 +168,10 @@ class BaseColumn(AuditMixinNullable, ImportMixin):
  def __repr__(self):
  return self.column_name
  - num_types = ('DOUBLE', 'FLOAT', 'INT', 'BIGINT', 'LONG', 'REAL', 'NUMERIC')
  + num_types = (
  + 'DOUBLE', 'FLOAT', 'INT', 'BIGINT',
  + 'LONG', 'REAL', 'NUMERIC', 'DECIMAL'
  + )
  date_types = ('DATE', 'TIME', 'DATETIME')
  str_types = ('VARCHAR', 'STRING', 'CHAR')
  