[jira] [Commented] (CALCITE-1924) Support operator "+" as string concat operator

["ZheHu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726892#comment-17726892 ] 

ZheHu commented on CALCITE-1924:
--------------------------------

According to the above discussions, I think we can resolve operator "+" to CONCAT when both operand are CHARACTER type, and it's only *enabled in MSSQL*.
I've alse run the following SQL in JdbcTest, which means Calcite now is able to convert strings to numbers.
{code}
SELECT '1' + '2' as alia
-- returns 3
{code}

Hi [~R0ger], do you have any progress yet?  I'd like to take a look at this case to see if I can help.


> Support operator "+" as string concat operator
> ----------------------------------------------
>
>                 Key: CALCITE-1924
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1924
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Roger Shi
>            Priority: Minor
>
> Currently the following SQL is not supported.
> {code}
> select 'A' + 'B' + 'C';
> {code}
> We get the exception:
> {noformat}
> Error while executing SQL "select 'A' + 'B' + 'C'": From line 1, column 8 to line 1, column 16: Cannot apply '+' to arguments of type '<CHAR(1)> + <CHAR(1)>'. Supported form(s): '<NUMERIC> + <NUMERIC>'
> '<DATETIME_INTERVAL> + <DATETIME_INTERVAL>'
> '<DATETIME> + <DATETIME_INTERVAL>'
> '<DATETIME_INTERVAL> + <DATETIME>' (state=,code=0)
> {noformat}
> In this JIRA, I'll fix this by supporting operator "+" as string concat operator.
> Similar to CALCITE-1374 and CALCITE-1897.



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