I'm trying to concatenate the element of int array to one string in hive.
The function concat_ws works only for string arrays, so I tried cast(my_int_array as string) but it's not working.
Any suggestion?
Add a comment
|
2 Answers
Try to transform using /bin/cat:
from mytable select transform(my_int_array) using '/bin/cat' as (my_int_array);
Second option is to alter table and replace delimiters:
1) ALTER TABLE mytable CHANGE COLUMN my_int_array = my_int_array_string string;
2) SELECT REPLACE(my_int_array_string, '\002', ', ') FROM mytable;
Comments
It seems that the easiest way is to write a custom UDF to perform this specific task:
public class ConcatIntArray extends UDF {
public String evaluate(ArrayList<Integer> in, final String delimiter){
return in.stream().map(u-> String.valueOf(u)).collect(Collectors.joining(delimiter));
}
}
