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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/08/09 09:17:46 UTC

[GitHub] [shardingsphere] strongduanmu opened a new issue #11722: Select statement parse error when include current_date function

strongduanmu opened a new issue #11722:
URL: https://github.com/apache/shardingsphere/issues/11722


   ### Which version of ShardingSphere did you use?
   
   master branch
   
   ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   
   ShardingSphere-JDBC
   
   ### Expected behavior
   
   execute select statement success
   
   ### Actual behavior
   
   throw exception——`line 1:56 no viable alternative at input '=current_date('`
   
   ### Reason analyze (If you can)
   
   ```g4
   regularFunction
       : completeRegularFunction
       | shorthandRegularFunction
       ;
       
   shorthandRegularFunction
       : CURRENT_DATE | CURRENT_TIME (LP_ NUMBER_? RP_)? | CURRENT_TIMESTAMP | LAST_DAY | LOCALTIME | LOCALTIMESTAMP
       ;
       
   completeRegularFunction
       : regularFunctionName (LP_ (expr (COMMA_ expr)* | ASTERISK_)? RP_)
       ;
       
   regularFunctionName
       : IF | LOCALTIME | LOCALTIMESTAMP | REPLACE | INTERVAL | MOD
       | DATABASE | SCHEMA | LEFT | RIGHT | DATE | DAY | GEOMETRYCOLLECTION
       | LINESTRING | MULTILINESTRING | MULTIPOINT | MULTIPOLYGON | POINT | POLYGON
       | TIME | TIMESTAMP | TIMESTAMP_ADD | TIMESTAMP_DIFF | DATE | CURRENT_TIMESTAMP | identifier
       ;
   ```
   
   From the following g4 file, we can see that the `current_date()` function is ambiguous. Due to the priority during parsing, the shorthandRegularFunction rule will be used for parsing, but the shorthandRegularFunction rule cannot parse the parentheses.
   
   We should define a parenthesized function with the same name in the completeRegularFunction rule to avoid parsing problems caused by priority.
   
   ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
   
   ### Example codes for reproduce this issue (such as a github link).
   


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[GitHub] [shardingsphere] tristaZero closed issue #11722: Select statement parse error when include current_date function

Posted by GitBox <gi...@apache.org>.
tristaZero closed issue #11722:
URL: https://github.com/apache/shardingsphere/issues/11722


   


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[GitHub] [shardingsphere] strongduanmu commented on issue #11722: Select statement parse error when include current_date function

Posted by GitBox <gi...@apache.org>.
strongduanmu commented on issue #11722:
URL: https://github.com/apache/shardingsphere/issues/11722#issuecomment-895076803


   This is mysql official doc for built-in function——https://dev.mysql.com/doc/refman/8.0/en/built-in-function-reference.html.


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