[GitHub] [shardingsphere] TeslaCN opened a new issue, #23537: Create a TypeCastExpressionSegment to unify PostgreSQL/openGauss type cast syntax

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

TeslaCN opened a new issue, #23537:
URL: https://github.com/apache/shardingsphere/issues/23537

   ## Refactor
   
   There are various PostgreSQL/openGauss type cast syntax:
   https://www.postgresql.org/docs/current/sql-expressions.html#SQL-SYNTAX-TYPE-CASTS
   https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-CONSTANTS-GENERIC
   
   Consider creating a `TypeCastExpressionSegment` to unify the SQL parse result.
   
   Example:
   ```sql
   select CAST(money '1' as varchar)::char(10)
   ```
   
   Parse result of PostgreSQL
   ```json
   {
     "version": 150001,
     "stmts": [
       {
         "stmt": {
           "SelectStmt": {
             "targetList": [
               {
                 "ResTarget": {
                   "val": {
                     "TypeCast": {
                       "arg": {
                         "TypeCast": {
                           "arg": {
                             "TypeCast": {
                               "arg": {
                                 "A_Const": {
                                   "sval": {
                                     "sval": "1"
                                   },
                                   "location": 18
                                 }
                               },
                               "typeName": {
                                 "names": [
                                   {
                                     "String": {
                                       "sval": "money"
                                     }
                                   }
                                 ],
                                 "typemod": -1,
                                 "location": 12
                               },
                               "location": -1
                             }
                           },
                           "typeName": {
                             "names": [
                               {
                                 "String": {
                                   "sval": "pg_catalog"
                                 }
                               },
                               {
                                 "String": {
                                   "sval": "varchar"
                                 }
                               }
                             ],
                             "typemod": -1,
                             "location": 25
                           },
                           "location": 7
                         }
                       },
                       "typeName": {
                         "names": [
                           {
                             "String": {
                               "sval": "pg_catalog"
                             }
                           },
                           {
                             "String": {
                               "sval": "bpchar"
                             }
                           }
                         ],
                         "typmods": [
                           {
                             "A_Const": {
                               "ival": {
                                 "ival": 10
                               },
                               "location": 40
                             }
                           }
                         ],
                         "typemod": -1,
                         "location": 35
                       },
                       "location": 33
                     }
                   },
                   "location": 7
                 }
               }
             ],
             "limitOption": "LIMIT_OPTION_DEFAULT",
             "op": "SETOP_NONE"
           }
         }
       }
     ]
   }
   ```
   


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: notifications-unsubscribe@shardingsphere.apache.org.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org

[GitHub] [shardingsphere] strongduanmu closed issue #23537: Create a TypeCastExpressionSegment to unify PostgreSQL/openGauss type cast syntax

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

strongduanmu closed issue #23537: Create a TypeCastExpressionSegment to unify PostgreSQL/openGauss type cast syntax
URL: https://github.com/apache/shardingsphere/issues/23537


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: notifications-unsubscribe@shardingsphere.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org