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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/08/24 01:38:05 UTC
[GitHub] [shardingsphere] sandynz opened a new issue #11966: SELECT COUNT(1) execution failed on PostgreSQL backend proxy
sandynz opened a new issue #11966:
URL: https://github.com/apache/shardingsphere/issues/11966
## Bug Report
### Which version of ShardingSphere did you use?
5.0.0-RC1-SNAPSHOT
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy, failed on PostgreSQL backend, works on MySQL backend
commit: 1975d8a1295f322e7d995a731d54251805c0706f
### Expected behavior
No error occur
### Actual behavior
```
sharding_db=> select count(1) from t_order;
ERROR: Can't find index: AggregationProjection(type=COUNT, innerExpression=(1), alias=Optional.empty, derivedAggregationProjections=[], index=-1), please add alias for aggregate selections
```
Stack trace:
```
[Connection-1-ThreadExecutor] o.a.s.p.f.c.CommandExecutorTask - Exception occur:
java.lang.IllegalStateException: Can't find index: AggregationProjection(type=COUNT, innerExpression=(1), alias=Optional.empty, derivedAggregationProjections=[], index=-1), please add alias for aggregate selections
at com.google.common.base.Preconditions.checkState(Preconditions.java:589)
at org.apache.shardingsphere.infra.binder.statement.dml.SelectStatementContext.setIndexForAggregationProjection(SelectStatementContext.java:175)
at org.apache.shardingsphere.infra.binder.statement.dml.SelectStatementContext.setIndexes(SelectStatementContext.java:168)
at org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.merge(ShardingDQLResultMerger.java:62)
at org.apache.shardingsphere.infra.merge.MergeEngine.executeMerge(MergeEngine.java:90)
at org.apache.shardingsphere.infra.merge.MergeEngine.merge(MergeEngine.java:80)
at org.apache.shardingsphere.proxy.backend.communication.DatabaseCommunicationEngine.mergeQuery(DatabaseCommunicationEngine.java:169)
at org.apache.shardingsphere.proxy.backend.communication.DatabaseCommunicationEngine.processExecuteQuery(DatabaseCommunicationEngine.java:135)
at org.apache.shardingsphere.proxy.backend.communication.DatabaseCommunicationEngine.execute(DatabaseCommunicationEngine.java:129)
at org.apache.shardingsphere.proxy.backend.text.data.impl.SchemaAssignedDatabaseBackendHandler.execute(SchemaAssignedDatabaseBackendHandler.java:55)
at org.apache.shardingsphere.proxy.frontend.postgresql.command.query.text.PostgreSQLComQueryExecutor.execute(PostgreSQLComQueryExecutor.java:71)
at org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:99)
at org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:72)
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)
### 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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[GitHub] [shardingsphere] tristaZero closed issue #11966: SELECT COUNT(1) execution failed on PostgreSQL backend proxy
Posted by GitBox <gi...@apache.org>.
tristaZero closed issue #11966:
URL: https://github.com/apache/shardingsphere/issues/11966
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