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Function in order by clause problem
Posted by: Michel DOMINIQUE
Date: September 25, 2015 07:45AM

Hello.

I'm struggling with function. I created a function which return TEXT string. I tried to use it in order by clause by it doesn't work.
The function is deterministic and called version_sort.
After creating the function, if I do
'select version_name from version order by version_sort("version_name", "desc")'
the result is not what expected. However if I get the TEXT returned by the function using 'select version_sort("version_name", "desc") from version limit 1'
and then replace the result in the first query, it's OK:

select version_name from version order by
CONVERT(SUBSTRING_INDEX(version_name,".",1), signed) desc,CONVERT(REPLACE(SUBSTRING_INDEX(version_name,".",2),CONCAT(SUBSTRING_INDEX(version_name,".",1),"."),""), signed) desc,CONVERT(REPLACE(SUBSTRING_INDEX(version_name,".",3),CONCAT(SUBSTRING_INDEX(version_name,".",2),"."),""), signed) desc,LOCATE(" ",version_name) asc,LENGTH(version_name) desc,version_name desc,CONVERT(REPLACE(SUBSTRING_INDEX(version_name,".",4),CONCAT(SUBSTRING_INDEX(version_name,".",3),"."),""), signed) desc


Is it possible to use function in 'order by' clause ?

Thanks for help
Michel.

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