How to calculate median in Hive

Question

I have a hive table,

name    age     sal
A       45      1222
B       50      4555
c       44      8888
D       78      1222
E       12      7888
F       23          


        

Answer 1

double median = 0;
double term = 0;
double term1 = 0;
if (size % 2 == 1)
{
    term = (size + 1 - 1) / 2;
    median = term;
}
else if (size % 2 == 0)

{
    
    term1 = (size - 1) / 2;
    term1 = term1 + ((size - 1) / 2) + 1;
    term1 = term1 / 2;
    median = term1;
}
cout << "Median of array: " << median << endl;

Answer 2

You can use the percentile function to compute the median. Try this:

select percentile(cast(age as BIGINT), 0.5) from table_name