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https://issues.apache.org/jira/browse/CALCITE-3589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17180975#comment-17180975
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bingfeng.guo commented on CALCITE-3589:
---------------------------------------
When I run the following two SQLs on PG, I found that PG will not throw
Exception, so I think that PG does not strictly stipulate whether it is group
by alias or group by underlying column . I think it is the priority group
byunderlying column, if there is no underlying column, then group by alias.
``` sql
{{select empno as d from emp group by d}}
{{select empno as d from emp group by empno}}
{{```}}
> SqlValidatorException when conformation is set to LENIENT
> ---------------------------------------------------------
>
> Key: CALCITE-3589
> URL: https://issues.apache.org/jira/browse/CALCITE-3589
> Project: Calcite
> Issue Type: Bug
> Reporter: bingfeng.guo
> Assignee: bingfeng.guo
> Priority: Critical
> Labels: pull-request-available
> Attachments: 屏幕快照 2019-12-12 下午5.56.24.png
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> error occurs conditions (all three conditions must be met):
> * conformance = LENIENT
> * The alias of the expression in select is the same as the column name of
> the column used in the expression
> * group by or having use the above expression
> {color:#172b4d}a simple example is as follows：{color}
> {color:#ff8b00}SELECT SELLER_ID + 1 AS SELLER_ID, sum(PRICE){color}
> {color:#ff8b00}FROM TEST_KYLIN_FACT{color}
> {color:#ff8b00}GROUP BY SELLER_ID + 1{color}
> {color:#172b4d}will change to {color}
> {color:#ff8b00}SELECT SELLER_ID + 1 AS SELLER_ID, sum(PRICE){color}
> {color:#ff8b00} FROM TEST_KYLIN_FACT{color}
> {color:#ff8b00} GROUP BY SELLER_ID + 1 + 1{color}
> {color:#172b4d}after
> org.apache.calcite.sql.validate.SqlValidatorImpl#expandGroupByOrHavingExpr{color}
>
>
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