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https://issues.apache.org/jira/browse/CALCITE-5348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624945#comment-17624945
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shampoo liu commented on CALCITE-5348:
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[~julianhyde] Thanks for review. I have updated the content.
> The defaultNullCollation configuration can't take effect for over
> -----------------------------------------------------------------
>
> Key: CALCITE-5348
> URL: https://issues.apache.org/jira/browse/CALCITE-5348
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.32.0
> Reporter: shampoo liu
> Priority: Major
>
> The connection configuration string defaultNullCollation=LOW can't take
> effect for order by in over clause.
> After debug, I found that the convertSortExpression in
> SqlToRelConverter.convertOver was changed to bb::sortToRex and the
> bb::sortToRex didn't read default configuration.
> [https://github.com/apache/calcite/blob/c945b7f49b99538748c871557f6ac80957be2b6e/core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java#L2247]
>
> Also, The corresponding test case is incorrect at
> org.apache.calcite.test.SqlToRelConverterTest#testUserDefinedOrderByOver .
> sql :
> {code:java}
> select deptno,rank() over(partition by empno order by deptno)
> from emp
> order by row_number() over(partition by empno order by deptno) {code}
> correct result
> {code:java}
> LogicalProject(DEPTNO=[$0], EXPR$1=[$1])
> LogicalSort(sort0=[$2], dir0=[ASC-nulls-first])
> LogicalProject(DEPTNO=[$7], EXPR$1=[RANK() OVER (PARTITION BY $0 ORDER BY
> $7 NULLS FIRST)], EXPR$2=[ROW_NUMBER() OVER (PARTITION BY $0 ORDER BY $7
> NULLS FIRST)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
> but was
> {code:java}
> LogicalProject(DEPTNO=[$0], EXPR$1=[$1])
> LogicalSort(sort0=[$2], dir0=[ASC-nulls-first])
> LogicalProject(DEPTNO=[$7], EXPR$1=[RANK() OVER (PARTITION BY $0 ORDER BY
> $7)], EXPR$2=[ROW_NUMBER() OVER (PARTITION BY $0 ORDER BY $7)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
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