Trino string split > every character-CodePudding

I want to do some profiling of characters that I seeing in a field, and a precursor of that is splitting a string value into its component characters.

With SQL Server I would have turned to the dark-side with a cursor, but I'm using AWS Athena so don't have that option.

Is there anyway I could approach this using Trino-SQL? I've taken a look at SPLIT and REGEXP_SPLIT(), but I can't see a way to pass them either a) a blank value for the split parameter (to split on all chars) b) to devise a regex pattern (to again split on all chars) ex Tried:

select s.str as original_str, u.str as exploded_value
from
(select 'www.google.com' as str) AS s
cross join unnest(regexp_split(s.str,'\D')) as u(str)

... which splits to 15 rows returned but no value for 'exploded value'. Is that because there is no distance between the splits?

Thanks in advance for any ideas!

CodePudding user response：

select s.str as original_str, u.str as exploded_value
from
(select 'www.google.com' as str) AS s
cross join unnest(regexp_extract_all(s.str,'.')) as u(str)