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Need Help in Hive storage format

Hi all,

If we run this query

insert overwrite local directory '/home/yogesh/Downloads/demoyy' select * from NYSE_LOCAL;

{
( describe NYSE_LOCAL ;

 exchange    string    
symbol    string    
ddate    string    
open    float    
high    float    
low    float    
) }

ls /home/yogesh/Downloads/demoyy/

it shows the file name 000000_0

my Question is:

1) In which format does file 000000_0 is?
2) what is the delimiter between columns?

Please help

Thanks & Regards
Yogesh Kumar