azexcy opened a new issue, #19104:
URL: https://github.com/apache/shardingsphere/issues/19104
## Bug Report
When using Proxy with PostgreSQL, execute `CREATE INDEX IF NOT EXISTS
idx_userid ON t_order ("user_id");`
The first time is success, but execute second time, the error will happen
```
sharding_db=> CREATE INDEX idx_userid ON t_order ("user_id");
CREATE INDEX
sharding_db=> CREATE INDEX IF NOT EXISTS idx_userid ON t_order ("user_id");
ERROR: Index 'idx_userid' already exists.
```
stack:
```
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: Exception in thread "Thread-22"
org.apache.shardingsphere.infra.exception.ShardingSphereException: Index
'idx_user_id' already exists.
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.sharding.route.engine.validator.ddl.impl.ShardingCreateIndexStatementValidator.preValidate(ShardingCreateIndexStatementValidator.java:50)
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.lambda$createRouteContext$0(ShardingSQLRouter.java:53)
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at java.util.Optional.ifPresent(Optional.java:159)
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.createRouteContext(ShardingSQLRouter.java:53)
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.sharding.route.engine.ShardingSQLRouter.createRouteContext(ShardingSQLRouter.java:45)
[INFO ] 2022-07-13 18:19:58.956 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.infra.route.engine.impl.PartialSQLRouteExecutor.route(PartialSQLRouteExecutor.java:57)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.infra.route.engine.SQLRouteEngine.route(SQLRouteEngine.java:53)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.route(KernelProcessor.java:57)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.infra.context.kernel.KernelProcessor.generateExecutionContext(KernelProcessor.java:49)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSphereStatement.createExecutionContext(ShardingSphereStatement.java:472)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSphereStatement.execute0(ShardingSphereStatement.java:426)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSphereStatement.execute(ShardingSphereStatement.java:357)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.core.prepare.datasource.AbstractDataSourcePreparer.executeTargetTableSQL(AbstractDataSourcePreparer.java:115)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.postgresql.prepare.datasource.PostgreSQLDataSourcePreparer.prepareTargetTables(PostgreSQLDataSourcePreparer.java:49)
[INFO ] 2022-07-13 18:19:58.957 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.prepareTarget(RuleAlteredJobPreparer.java:149)
[INFO ] 2022-07-13 18:19:58.958 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.prepareAndCheckTarget(RuleAlteredJobPreparer.java:130)
[INFO ] 2022-07-13 18:19:58.958 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.prepareAndCheckTargetWithLock(RuleAlteredJobPreparer.java:110)
[INFO ] 2022-07-13 18:19:58.958 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobPreparer.prepare(RuleAlteredJobPreparer.java:84)
[INFO ] 2022-07-13 18:19:58.958 [docker-java-stream--2104374941]
:Scaling-Proxy - STDOUT: at
org.apache.shardingsphere.data.pipeline.scenario.rulealtered.RuleAlteredJobScheduler.run(RuleAlteredJobScheduler.java:74)
```
The create table sql
```
CREATE TABLE t_order (order_id INT NOT NULL, user_id INT NOT NULL, status
VARCHAR(45) NULL, PRIMARY KEY (order_id));
```
### Which version of ShardingSphere did you use?
master
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
No error happend, like at Navicat
<img width="760" alt="image"
src="https://user-images.githubusercontent.com/101622833/178709973-cbd6eea9-6b1c-4ce9-ae6c-7bf58d6a9079.png";>
### Actual behavior
throw exception
### Reason analyze (If you can)
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
### Example codes for reproduce this issue (such as a github link).
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