[GitHub] [shardingsphere] RaigorJiang commented on issue #18434: When use DistSQL excute 'preview select * from e;' ,Showing unexpected results

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

RaigorJiang commented on issue #18434:
URL: https://github.com/apache/shardingsphere/issues/18434#issuecomment-1189845077

   @wsm12138 
   After verification, I found that the reason was that the routing results did not meet expectations when creating table, so the preview query got that result.
   
   #### sql_parser rule
   ```sql
   postgres=> SHOW SQL_PARSER RULE;
    sql_comment_parse_enable |              parse_tree_cache              |             sql_statement_cache
   --------------------------+--------------------------------------------+----------------------------------------------
    true                     | {"initialCapacity":128,"maximumSize":1024} | {"initialCapacity":2000,"maximumSize":65535}
   (1 row)
   ```
   
   #### routing of create table
   ```
   [INFO ] 2022-07-20 13:22:14.462 [Connection-2-ThreadExecutor] ShardingSphere-SQL - Logic SQL: /* ShardingSphere hint: dataSourceName=ds_0 */ CREATE TABLE g(id int, name char);
   [INFO ] 2022-07-20 13:22:14.462 [Connection-2-ThreadExecutor] ShardingSphere-SQL - SQLStatement: PostgreSQLCreateTableStatement(super=CreateTableStatement(super=AbstractSQLStatement(parameterCount=0, parameterMarkerSegments=[], commentSegments=[CommentSegment(text=/* ShardingSphere hint: dataSourceName=ds_0 */, startIndex=0, stopIndex=45)]), table=SimpleTableSegment(tableName=TableNameSegment(startIndex=60, stopIndex=60, identifier=IdentifierValue(value=g, quoteCharacter=NONE)), owner=Optional.empty, alias=Optional.empty), columnDefinitions=[ColumnDefinitionSegment(startIndex=62, stopIndex=67, columnName=ColumnSegment(startIndex=62, stopIndex=63, identifier=IdentifierValue(value=id, quoteCharacter=NONE), owner=Optional.empty), dataType=DataTypeSegment(startIndex=65, stopIndex=67, dataTypeName=int, dataLength=null), primaryKey=false, notNull=false, referencedTables=[]), ColumnDefinitionSegment(startIndex=70, stopIndex=78, columnName=ColumnSegment(startIndex=70, stopIndex=73, identi
 fier=IdentifierValue(value=name, quoteCharacter=NONE), owner=Optional.empty), dataType=DataTypeSegment(startIndex=75, stopIndex=78, dataTypeName=char, dataLength=null), primaryKey=false, notNull=false, referencedTables=[])], constraintDefinitions=[]), ifNotExists=false)
   [INFO ] 2022-07-20 13:22:14.462 [Connection-2-ThreadExecutor] ShardingSphere-SQL - Actual SQL: ds_1 ::: /* ShardingSphere hint: dataSourceName=ds_0 */ CREATE TABLE g(id int, name char);
   ```
   
   


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