[I] SQL Federation (PostgreSQL): SELECT version() got `Exception` when `ALL_QUERY_USE_SQL_FEDERATION=true` [shardingsphere]

["duerwuyi (via GitHub)" <gi...@apache.org>]

duerwuyi opened a new issue, #37436:
URL: https://github.com/apache/shardingsphere/issues/37436

   ## Bug Report
   
   ### Which version of ShardingSphere did you use?
   
   shardingsphere-proxy 5.5.2
   postgres 17.2 as backend
   
   ### Expected behavior
   
   `select version();` should return the string of PG version, like:
   ```sql
   testdb=> select version();
                                                         version                                                       
   --------------------------------------------------------------------------------------------------------------------
    PostgreSQL 17.6 (Debian 17.6-2.pgdg13+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit
   ```
   
   ### Actual behavior
   The following query fails with:
   ERROR:  SQL federation does not support SQL 'select version();'.
   
   ```sql
   testdb=> select version();
   ERROR:  SQL federation does not support SQL 'select version();'.
   More details: org.apache.calcite.runtime.CalciteContextException: At line 0, column 0: No match found for function signature version()
   ```
   
   Though we knew that federation is an experimental feature,  common PG functions like `select version()`  could better be supported.
   
   ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
   
   [ss_postgres.zip](https://github.com/user-attachments/files/24252329/ss_postgres.zip)
   
   run `docker compose up -d` in this file.
   
   SQL to execute are shown above
   


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Re: [I] SQL Federation (PostgreSQL): SELECT version() got `Exception` when `ALL_QUERY_USE_SQL_FEDERATION=true` [shardingsphere]

["duerwuyi (via GitHub)" <gi...@apache.org>]

duerwuyi closed issue #37436: SQL Federation (PostgreSQL): SELECT version() got `Exception` when `ALL_QUERY_USE_SQL_FEDERATION=true`
URL: https://github.com/apache/shardingsphere/issues/37436


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