[
https://issues.apache.org/jira/browse/CALCITE-2601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838347#comment-16838347
]
pingle wang commented on CALCITE-2601:
--------------------------------------
[~julianhyde] mysql, sql server, hive, postgresql, oracle also use REVERSE
function.
mysql
```sql
mysql> SELECT REVERSE('abcd');
+---------------------------------------------------------+ | REVERSE('abcd') |
+---------------------------------------------------------+ | dcba |
+---------------------------------------------------------+ 1 row in set (0.00
sec)
```
sql server
```
DECLARE @str NVARCHAR(100)
SET @str='ABCD'
SELECT REVERSE(@str)
```
pg
```
testdb=# SELECT REVERSE('abcd'); reverse--------- dcba(1 row)
```
oracle
```
SQL> select reverse('12345') from dual;
REVER
-----
54321
```
doc:
[https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_reverse]
[https://docs.microsoft.com/en-us/sql/integration-services/expressions/reverse-ssis-expression?view=sql-server-2017]
> Support REVERSE(str) in SqlFunctions
> ------------------------------------
>
> Key: CALCITE-2601
> URL: https://issues.apache.org/jira/browse/CALCITE-2601
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: TANG Wen-hui
> Priority: Major
>
> Returns the string _{{str}}_ with the order of the characters reversed.
> I think ’Reverse‘ seems to be a generic function.
>
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