[BUGS] small bug in ADD CONSTRAINT

[Joseph Shraibman]

This works:

 ALTER TABLE segment ADD CONSTRAINT  name  unique(textfield, reseller);

This doesn't:
 ALTER TABLE segment ADD CONSTRAINT  name  unique(lower(textfield), 
reseller);

I had to create a unique index.

---------------------------(end of broadcast)---------------------------
TIP 7: don't forget to increase your free space map settings