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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