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https://issues.apache.org/jira/browse/CALCITE-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-6046.
----------------------------------
    Fix Version/s:     (was: 1.36.0)
       Resolution: Duplicate

> SQL parser failed when parsing a comment string start with '&u'
> ---------------------------------------------------------------
>
>                 Key: CALCITE-6046
>                 URL: https://issues.apache.org/jira/browse/CALCITE-6046
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.35.0
>            Reporter: xiaogang zhou
>            Priority: Major
>
> quoteStringLiteralUnicode returns unparsed string with u&' prefix, which will 
> cause the SqlLiteral 
>  
> for example with a SQL
>  
> {code:java}
> // code placeholder
> CREATE TABLE source (
>     a BIGINT
> ) comment '测试test'
> WITH (
>   'connector' = 'test'
> ); {code}
> with a parsed Sqlnode, the toString will create a SQL like below, which is 
> not parsable again.
>  
> {code:java}
> // code placeholder
> CREATE TABLE `source` (
>   `a` BIGINT
> )
> COMMENT u&'\5218\51eftest' WITH (
>   'connector' = 'test'
> ) {code}
> I think this is caused by 
> {code:java}
> // code placeholder
> public void quoteStringLiteralUnicode(StringBuilder buf, String val) {
>   buf.append("u&'"); {code}
> not sure if I misconfigured something. Is it possiable to remove the 
> buf.append("u&'"); ?



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