[jira] [Updated] (CALCITE-3261) Make JDBC output column labels more human readable

["Xiaoguang Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-3261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiaoguang Zhang updated CALCITE-3261:
-------------------------------------
    Summary: Make JDBC output column labels more human readable  (was: Incorrect output field names from jdbc)

> Make JDBC output column labels more human readable
> --------------------------------------------------
>
>                 Key: CALCITE-3261
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3261
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core, jdbc-adapter
>            Reporter: Xiaoguang zhang
>            Priority: Major
>
> After implementing the missing `print(ResultSet)` method from the examples in Calcite [tutorial|[https://calcite.apache.org/docs/index.html]], I found that the output field names are incorrect:
> {code:java}
> [deptno, EXPR$1]
> [1, 1]
> [2, 2]
> {code}
> The field name `EXPR$1` can be improved to be more human readable like MySQL client:
> {code:java}
> +--------+--------------+
> | deptno | min(e.empid) |
> +--------+--------------+
> |      1 |            1 |
> |      2 |            2 |
> +--------+--------------+
> {code}
>  
> PS: the sql statement generating the above outputs:
> {code:sql}
> select d.deptno, min(e.empid) from hr.emps as e join hr.depts as d on e.deptno = d.deptno group by d.deptno having count(*) > 1
> {code}



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