How long ROW ID is?

64 Bits...

AMP receives 32 bit hash value and row data from PE. AMP then append a 32 bit unique value to row HASH to make 64 bit ROW ID.

ROW ID is used to sort rows in AMP

First AMP checks is there any row with same HASH value? If yes, then it append32 bit 1 to (0000 0000 0000 0000 0000 0000 0000 0001) to row hash and make it 64 bit ROW ID... If one more row comes with same hash value then it appends 2( 0000 0000 0000 0000 0000 0000 0000 0010) to Row HASH....It goes like that

So how many rows can be inserted with same value on a column/columns on which Primary index is created ? ( 2^32).... after that? I dont Know