[GitHub] [shardingsphere] strongduanmu opened a new issue, #21231: Wrong result return when execute openGauss `select limit 1, 2` statement with sql federation

[GitBox <gi...@apache.org>]

strongduanmu opened a new issue, #21231:
URL: https://github.com/apache/shardingsphere/issues/21231

   ## Bug Report
   
   ### Which version of ShardingSphere did you use?
   
   https://github.com/apache/shardingsphere/commit/684eaa5d02978b54a3f63c8c3aa286bf4d590234
   
   ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   
   ShardingSphere-Proxy
   
   ### Expected behavior
   
   ```sql
   [ WITH [ RECURSIVE ] with_query [, ...] ]
   SELECT [/*+ plan_hint */] [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ]
   { * | {expression [ [ AS ] output_name ]} [, ...] }
   [ FROM from_item [, ...] ]
   [ WHERE condition ]
   [ [ START WITH condition ] CONNECT BY [NOCYCLE] condition [ ORDER SIBLINGS BY expression ] ]
   [ GROUP BY grouping_element [, ...] ]
   [ HAVING condition [, ...] ]
   [ WINDOW {window_name AS ( window_definition )} [, ...] ]
   [ { UNION | INTERSECT | EXCEPT | MINUS } [ ALL | DISTINCT ] select ]
   [ ORDER BY {expression [ [ ASC | DESC | USING operator ] | nlssort_expression_clause ] [ NULLS { FIRST | LAST } ]} [, ...] ]
   [ LIMIT { [offset,] count | ALL } ]
   [ OFFSET start [ ROW | ROWS ] ]
   [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ]
   [ {FOR { UPDATE | NO KEY UPDATE | SHARE | KEY SHARE } [ OF table_name [, ...] ] [ NOWAIT ]} [...] ];
   ```
   
   According to openGauss select limit sytax, this sql should result following result.
   
   ```sql
   sharding_db=> select * from test where aid > 0;
    aid | aname | bid | bname
   -----+-------+-----+-------
      2 | a     |   2 | b
      3 | a     |   3 | b
   (2 rows)
   
   sharding_db=> select * from test where aid > 0 limit 1, 2;
    aid | aname | bid | bname
   -----+-------+-----+-------
      3 | a     |   3 | b
   (1 rows)
   ```
   
   ### Actual behavior
   
   It seems that the SQL parsing engine parses count and offset incorrectly.
   
   ```sql
   sharding_db=> select * from test where aid > 0;
    aid | aname | bid | bname
   -----+-------+-----+-------
      2 | a     |   2 | b
      3 | a     |   3 | b
   (2 rows)
   
   sharding_db=> select * from test where aid > 0 limit 1, 2;
    aid | aname | bid | bname
   -----+-------+-----+-------
   (0 rows)
   ```
   
   ### Reason analyze (If you can)
   
   ### 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 #21231: Wrong result return when execute openGauss `select limit 1, 2` statement with sql federation

[GitBox <gi...@apache.org>]

tristaZero closed issue #21231: Wrong result return when execute openGauss `select limit 1, 2` statement with sql federation
URL: https://github.com/apache/shardingsphere/issues/21231


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