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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