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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2022/06/20 03:17:46 UTC
[GitHub] [shardingsphere] peilinqian opened a new issue, #18433: “fetch from cursor1”syntax is not supported
peilinqian opened a new issue, #18433:
URL: https://github.com/apache/shardingsphere/issues/18433
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### Which version of ShardingSphere did you use?
we find java version: java8, full_version=1.8.0_282
ShardingSphere-5.1.2-SNAPSHOT
Commit ID: 952c1feacb26bc03ea4ea14d9f82b0d5777732c2
Commit Message: Update shasum arguments in Release documents (#18344)
Branch: master
Build time: 2022-06-13T19:07:26+0000
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
fetch from cursor1; succeed
### Actual behavior
order_db=> cursor cursor1 for select * from cur_test_01 order by 1;
order_db=> fetch from cursor1;
ERROR: You have an error in your SQL syntax
### Reason analyze (If you can)
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
drop table if exists cur_test_01;
create table cur_test_01(c_id int,c_num int,c_name varchar(10),c_city varchar(10),c_add varchar(20));
insert into cur_test_01 values(1,18,'Allen','Beijing','AAAAABAAAAA'),(2,368,'Bob','Shanghai','AAAAACAAAAA'),
(3,59,'Cathy','Shenzhen','AAAAADAAAAA'),(4,96,'David','Suzhou','AAAAAEAAAAA'),
(5,17,'Edrwd','Fenghuang','AAAAAFAAAAA'),(6,253,'Fendi','Changsha','AAAAAGAAAAA');
start transaction;
cursor cursor1 for select * from cur_test_01 order by 1;
fetch from cursor1;
close cursor1;
end;
### Example codes for reproduce this issue (such as a github link).
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[GitHub] [shardingsphere] tuichenchuxin closed issue #18433: “fetch from cursor1”syntax is not supported
Posted by GitBox <gi...@apache.org>.
tuichenchuxin closed issue #18433: “fetch from cursor1”syntax is not supported
URL: https://github.com/apache/shardingsphere/issues/18433
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[GitHub] [shardingsphere] strongduanmu commented on issue #18433: “fetch from cursor1”syntax is not supported
Posted by GitBox <gi...@apache.org>.
strongduanmu commented on issue #18433:
URL: https://github.com/apache/shardingsphere/issues/18433#issuecomment-1159925746
@peilinqian Thank you for your feedback. I found that the syntax description in the [openGauss documentation](https://opengauss.org/zh/docs/1.0.1/docs/Developerguide/FETCH.html) is wrong, it is inconsistent with the logic in the openGauss source code.
Following is openGuass fetch syntax in official document.
```sql
FETCH [ direction { FROM | IN } ] cursor_name;
```
However, the real openGauss syntax is implemented as follows, the user can use the FROM | IN parameter without specifying the direction.
```
/*****************************************************************************
*
* QUERY:
* fetch/move
*
*****************************************************************************/
FetchStmt: FETCH fetch_args
{
FetchStmt *n = (FetchStmt *) $2;
n->ismove = FALSE;
$$ = (Node *)n;
}
| MOVE fetch_args
{
FetchStmt *n = (FetchStmt *) $2;
n->ismove = TRUE;
$$ = (Node *)n;
}
;
fetch_args: cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $1;
n->direction = FETCH_FORWARD;
n->howMany = 1;
$$ = (Node *)n;
}
| from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $2;
n->direction = FETCH_FORWARD;
n->howMany = 1;
$$ = (Node *)n;
}
| NEXT opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_FORWARD;
n->howMany = 1;
$$ = (Node *)n;
}
| PRIOR opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_BACKWARD;
n->howMany = 1;
$$ = (Node *)n;
}
| FIRST_P opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_ABSOLUTE;
n->howMany = 1;
$$ = (Node *)n;
}
| LAST_P opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_ABSOLUTE;
n->howMany = -1;
$$ = (Node *)n;
}
| ABSOLUTE_P SignedIconst opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $4;
n->direction = FETCH_ABSOLUTE;
n->howMany = $2;
$$ = (Node *)n;
}
| RELATIVE_P SignedIconst opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $4;
n->direction = FETCH_RELATIVE;
n->howMany = $2;
$$ = (Node *)n;
}
| SignedIconst opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_FORWARD;
n->howMany = $1;
$$ = (Node *)n;
}
| ALL opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_FORWARD;
n->howMany = FETCH_ALL;
$$ = (Node *)n;
}
| FORWARD opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_FORWARD;
n->howMany = 1;
$$ = (Node *)n;
}
| FORWARD SignedIconst opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $4;
n->direction = FETCH_FORWARD;
n->howMany = $2;
$$ = (Node *)n;
}
| FORWARD ALL opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $4;
n->direction = FETCH_FORWARD;
n->howMany = FETCH_ALL;
$$ = (Node *)n;
}
| BACKWARD opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $3;
n->direction = FETCH_BACKWARD;
n->howMany = 1;
$$ = (Node *)n;
}
| BACKWARD SignedIconst opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $4;
n->direction = FETCH_BACKWARD;
n->howMany = $2;
$$ = (Node *)n;
}
| BACKWARD ALL opt_from_in cursor_name
{
FetchStmt *n = makeNode(FetchStmt);
n->portalname = $4;
n->direction = FETCH_BACKWARD;
n->howMany = FETCH_ALL;
$$ = (Node *)n;
}
;
from_in: FROM {}
| IN_P {}
;
opt_from_in: from_in {}
| /* EMPTY */ {}
;
```
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