[jira] [Comment Edited] (CALCITE-5044) OrderBy constant executing RelToSql ambiguously

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

    [ https://issues.apache.org/jira/browse/CALCITE-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17510502#comment-17510502 ] 

Xurenhe edited comment on CALCITE-5044 at 3/22/22, 1:56 PM:
------------------------------------------------------------

Yes, I agree with you.

We could define a switch[\{*}removeOrderByConstantKey] *in *SqlDialect* whether remove constant keys in order-by.

Please review this [PR-2749|[https://github.com/apache/calcite/pull/2749]], if you have a time.|https://github.com/apache/calcite/pull/2749],]

Thanks a lot.


was (Author: wojustme):
Yes, I agree with you.

We could define a switch[{*}removeOrderByConstantKey]{*} in *SqlDialect* whether remove constant keys in order-by.

Please review this [PR-2749|[https://github.com/apache/calcite/pull/2749], if you have a time.|https://github.com/apache/calcite/pull/2749],]

Thanks a lot.

> OrderBy constant executing RelToSql ambiguously
> -----------------------------------------------
>
>                 Key: CALCITE-5044
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5044
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Xurenhe
>            Assignee: Xurenhe
>            Priority: Major
>         Attachments: image-2022-03-17-21-45-22-988.png
>
>
>  
> There is ambiguous in the rel-to-sql's converter when meeting `order by constant `.
> Here is an example:
> {code:java}
> @Test void testOderByConstant() {
>   final Function<RelBuilder, RelNode> relFn = b -> b
>       .scan("EMP")
>       .project(b.literal(1), b.field(1), b.field(2))
>       .sort(RelCollations.of(ImmutableList.of(
>           new RelFieldCollation(0), new RelFieldCollation(1))))
>       .project(b.field(2), b.field(1))
>       .build();
>   final String expected = "";
>   relFn(relFn).ok(expected);
> } {code}
> Return sql:
> {code:java}
> SELECT "JOB", "ENAME"
> FROM "scott"."EMP"
> ORDER BY 1, "ENAME" {code}
> But, `ORDER BY 1` may mean 'sort by the first column in the select list'  because of SqlConformance#isSortByOrdinal.
>  
> I keep this the same semantics, by apply the rule of `CoreRules#SORT_REMOVE_CONSTANT_KEYS`
> Should the rel_to_sql's converter support it natively?
> *CODE:* https://github.com/wojustme/calcite/blob/6ad04e85875d9202e592a78cca8db807c5bde362/core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java#L1601
>  



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