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https://issues.apache.org/jira/browse/CALCITE-5510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682738#comment-17682738
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Julian Hyde commented on CALCITE-5510:
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It sounds reasonable. I think most people would want this to be the default
behavior (provided, as you say, the dialect supports ordinals in ORDER BY, as
most do).
> 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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