BUG #16507: RTRIM function doesnt behave as expected for certain scenario
The following bug has been logged on the website:
Bug reference: 16507
Logged by: Chetan Burande
Email address: chetan.burande7@gmail.com
PostgreSQL version: Unsupported/Unknown
Operating system: Linux
Description:
Hi Team,
I am trying to use RTIM function on a String (Column data) to remove some
character/string from the right end.
Example -
select column_name, RTRIM(column_name, '-1') from table_name;
column_name | rtrim
-----------------------------------------+---------------------------------------
test-2020_03_01-2020_03_31-1 | test-2020_03_01-2020_03_3
test-2019_02_01-2019_02_28-1 | test-2019_02_01-2019_02_28
test-2019_04_01-2019_04_30-1 | test-2019_04_01-2019_04_30
In case of the first string, RTRIM is removing "1-1" instead of "-1".
I expect it to remove "-1" as it did in other strings.
Please let me know if you need any further information.
Thanks,
Chetan
PG Bug reporting form <noreply@postgresql.org> writes:
I am trying to use RTIM function on a String (Column data) to remove some
character/string from the right end.
Example -
select column_name, RTRIM(column_name, '-1') from table_name;
In case of the first string, RTRIM is removing "1-1" instead of "-1".
I expect it to remove "-1" as it did in other strings.
Your expectation is wrong, per the function's documentation:
Removes the longest string containing only characters in
'characters' (a space by default) from the end of 'string'.
The example is pretty explicit about this, too:
rtrim('testxxzx', 'xyz') → test
You could do what you want with regexp_replace() or the pattern-matching
variant of substring().
regards, tom lane