Max (in value) of columns (in a single row) in Hive -


how max value different columns row in hive?

for instance

row# id# col1 col2 col3 1    1234  54  67  86 2    5678  89   92 86 ... ...

looking output of form:

1234 86 5678 92

thanks!

hive has greatest() function of 1.1;

select id, greatest(col1, col2, col3) greatest_value table;

or can use case when statement if version doesn't have greatest():

select id , case    when col1 >  col2 , col1 >  col3 col1    when col2 >  col3                  col2    else                                    col3   end greatest_value  table ;

case when statements evaluated in order top bottom until value of true found, no need evaluate 2 inequalities in each when clause.


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