[jira] [Commented] (CALCITE-5510) RelToSqlConverter don't support sort by ordinal when sort by column is a expression

["Sheng Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-5510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682884#comment-17682884 ] 

Sheng Wang commented on CALCITE-5510:
-------------------------------------

RelToConverter will convert ordinal to real expr, so if original is:

{code:java}
select a, sum(b) from table group by a order by a
{code}
What is the expected result?
{code:java}
select a, sum(b) from table group by a order by a
{code}
or
{code:java}
select a, sum(b) from table group by a order by 1
{code}
Also, for this sql:
{code:java}
select a, sum(b) as b from table group by a order by b
{code}
What is the expected result?
{code:java}
select a, sum(b) as b from table group by a order by b
{code}
or
{code:java}
select a, sum(b) as b from table group by a order by 2
{code}


> RelToSqlConverter don't support sort by ordinal when sort by column is a expression
> -----------------------------------------------------------------------------------
>
>                 Key: CALCITE-5510
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5510
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.26.0
>            Reporter: peng wang
>            Priority: Major
>
> For example:
> Query SQL is 
> {code:java}
> select a, sum(b) from table group by a order by 2{code}
> When we convert this sql to relNode and convert it back to SQL by RelToConverter, the result is:
> {code:java}
> select a, sum(b) from table group by a order by sum(b){code}
> But we want to keep order by column to ordinal.
> Would we add a switch in RelToConverter to control whether convert sort by column to expression or ordinal?
> Maybe we can use method isSortByOrdinal in dialect SqlConformance?



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