Field aliases all lowercase restriction in HCatBaseStorer

[Julien Le Dem]

In HCatBasedStorer (line 428) there is a check to verify field aliases are all 
lower case.
What's the reason for this ? It seems unnecessary, can we remove it ?
thank you 
Julien

if(alias.matches(".*[A-Z]+.*")) {
  throw new FrontendException("Column names should all be in lowercase. Invalid 
name found: "+alias, PigHCatUtil.PIG_EXCEPTION_CODE);
}