Issue with Decimal(38,0) data type in BTEQ - response (6) by drmkd17

Hi,
I have created a table like create table a(col1 decimal(38,0),b integer)
i want to keep my col1 as identity. But when i look at the table in bteq it shows a dot after the value.
Why does this dot appear. is there any setting required???
Can i create this col1 as identity or i should use BIGINT. Which is preferable.
 
Thanks,