将 bigint 转换为 hive 中的科学数

Question

I am trying to convert bigint to scientific number in hive using cast function as below

select cast(805454539 as float) from table name;

Above query is giving me 805454528

However, I am looking for something like 8.05454539E8

Answer 1

To convert float to scientific notation string representation you can use printf() function (8 in this example - is the number of decimal places):

select printf('%1.8e',cast(805454539 as double))

result:

8.05454539e+08