sandynz opened a new issue, #23603:
URL: https://github.com/apache/shardingsphere/issues/23603
## Bug Report
### Which version of ShardingSphere did you use?
master, 8c58db88d879428ec80d98ae04ff4661d7dde0af
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
proxy, PostgreSQL backend
### Expected behavior
Drop table succeed
### Actual behavior
Drop table failed
```
sharding_db=> CREATE SHARDING TABLE RULE T_ORDER(
sharding_db(> STORAGE_UNITS(ds_2,ds_3,ds_4),
sharding_db(> SHARDING_COLUMN=order_id,
sharding_db(> TYPE(NAME="hash_mod",PROPERTIES("sharding-count"="6")),
sharding_db(> KEY_GENERATE_STRATEGY(COLUMN=order_id,TYPE(NAME="snowflake"))
sharding_db(> );
SUCCESS
sharding_db=> CREATE TABLE t_order (order_id INT NOT NULL, user_id INT NOT
NULL, status VARCHAR(45) NULL, PRIMARY KEY (order_id));
CREATE TABLE
sharding_db=> select * from t_order;
order_id | user_id | status
----------+---------+--------
(0 rows)
sharding_db=> drop table t_order;
ERROR: org.postgresql.util.PSQLException
```
No exception stack trace in proxy log, after debug, the exception is:
```
org.apache.shardingsphere.dialect.exception.syntax.table.NoSuchTableException
at
org.apache.shardingsphere.sharding.route.engine.validator.ddl.ShardingDDLStatementValidator.validateTableExist(ShardingDDLStatementValidator.java:64)
at
org.apache.shardingsphere.sharding.route.engine.validator.ddl.impl.ShardingDropTableStatementValidator.preValidate(ShardingDropTableStatementValidator.java:56)
at
org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.lambda$createRouteContext$0(ShardingSQLRouter.java:55)
at java.util.Optional.ifPresent(Optional.java:159)
at
org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.createRouteContext(ShardingSQLRouter.java:55)
at
org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.createRouteContext(ShardingSQLRouter.java:46)
at
org.apache.shardingsphere.infra.route.engine.impl.PartialSQLRouteExecutor.route(PartialSQLRouteExecutor.java:69)
at
org.apache.shardingsphere.infra.route.engine.SQLRouteEngine.route(SQLRouteEngine.java:55)
at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.route(KernelProcessor.java:59)
at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.generateExecutionContext(KernelProcessor.java:51)
at
org.apache.shardingsphere.proxy.backend.communication.DatabaseCommunicationEngine.execute(DatabaseCommunicationEngine.java:170)
at
org.apache.shardingsphere.proxy.frontend.postgresql.command.query.simple.PostgreSQLComQueryExecutor.execute(PostgreSQLComQueryExecutor.java:77)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:110)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:77)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
### Reason analyze (If you can)
There's no table metadata in schema:
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
`server.yaml`
```
mode:
type: Cluster
repository:
type: ZooKeeper
props:
namespace: governance_ds
server-lists: localhost:2181
retryIntervalMilliseconds: 500
timeToLiveSeconds: 60
maxRetries: 3
operationTimeoutMilliseconds: 500
authority:
users:
- user: root@%
password: root
- user: sharding
password: sharding
privilege:
type: ALL_PERMITTED
#transaction:
# defaultType: XA
# providerType: Atomikos
sqlParser:
sqlCommentParseEnabled: false
sqlStatementCache:
initialCapacity: 2000
maximumSize: 65535
parseTreeCache:
initialCapacity: 128
maximumSize: 1024
#cdc:
# enabled: false
# port: 33071
props:
max-connections-size-per-query: 1
kernel-executor-size: 16 # Infinite by default.
proxy-frontend-flush-threshold: 128 # The default value is 128.
proxy-hint-enabled: false
sql-show: false
check-table-metadata-enabled: false
# Proxy backend query fetch size. A larger value may increase the memory
usage of ShardingSphere Proxy.
# The default value is -1, which means set the minimum value for
different JDBC drivers.
proxy-backend-query-fetch-size: -1
proxy-frontend-executor-size: 0 # Proxy frontend executor size. The
default value is 0, which means let Netty decide.
# Available options of proxy backend executor suitable: OLAP(default),
OLTP. The OLTP option may reduce time cost of writing packets to client, but it
may increase the latency of SQL execution
# and block other clients if client connections are more than
`proxy-frontend-executor-size`, especially executing slow SQL.
proxy-backend-executor-suitable: OLAP
proxy-frontend-max-connections: 0 # Less than or equal to 0 means no
limitation.
# Available sql federation type: NONE (default), ORIGINAL, ADVANCED
sql-federation-type: NONE
proxy-mysql-default-version: 5.7.22 # In the absence of schema name, the
default version will be used.
proxy-default-port: 3307 # Proxy default port.
proxy-netty-backlog: 1024 # Proxy netty backlog.
proxy-frontend-database-protocol-type: PostgreSQL
```
Execute SQLs in PostgreSQL:
```
DROP DATABASE IF EXISTS migration_ds_10;
CREATE DATABASE migration_ds_10;
DROP DATABASE IF EXISTS migration_ds_11;
CREATE DATABASE migration_ds_11;
DROP DATABASE IF EXISTS migration_ds_12;
CREATE DATABASE migration_ds_12;
```
Execute DistSQLs in proxy:
```
CREATE SHARDING TABLE RULE T_ORDER(
STORAGE_UNITS(ds_2,ds_3,ds_4),
SHARDING_COLUMN=order_id,
TYPE(NAME="hash_mod",PROPERTIES("sharding-count"="6")),
KEY_GENERATE_STRATEGY(COLUMN=order_id,TYPE(NAME="snowflake"))
);
CREATE TABLE t_order (order_id INT NOT NULL, user_id INT NOT NULL, status
VARCHAR(45) NULL, PRIMARY KEY (order_id));
SELECT * FROM t_order;
DROP TABLE t_order;
DROP TABLE T_ORDER;
```
### Example codes for reproduce this issue (such as a github link).
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