the argument to rank is simply some value, whereas the rank function
compare this value
to the previous value received, if value is same, rank returns ++index,
otherwise, rank return 1.
pseudo code:
class Rank {
int index;
Object previousValue = null;
int evaluate(Object value) {
if (value == previousValue) {
return ++index;
}
previousValue = value;
index = 1;
return 1;
}
On Wed, Jul 24, 2013 at 9:59 PM, j.barrett Strausser <
[email protected]> wrote:
> It seems as though I am required to pass in an argument to RANK().
>
> What is the effect of passing this argument in ?
>
> In a RANK function the output for RANK should be the number of rows
> preceding
> a row in a given window. As windows are specified by the partition and
> order by fields I don't understand the effect of passing in an arg to RANK
>
> Are the other non-aggregate function similar? Meaning : Cume_dist, Ntile
> --
>
>
> https://github.com/bearrito
> @deepbearrito
>
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