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https://issues.apache.org/jira/browse/CALCITE-4512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17339203#comment-17339203
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Julian Hyde commented on CALCITE-4512:
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MySQL's "partial group by" feature is an outlier in the industry. For example,
it will treat
{code}SELECT deptno, ename
FROM Emp
GROUP BY deptno{code} as valid and return an arbitrary employee name.
Thankfully you can turn that behavior off using {{ONLY_FULL_GROUP_BY}}, but
MySQL added a bunch of such features in its early days (e.g. treating integers
as booleans) that it has still not fully removed. Therefore I am still not
inclined to trust MySQL when it comes to discerning "reasonable" and "industry
standard" SQL semantics.
BigQuery is more trustworthy.
> group by expression has argument name same with select list item alias,
> causes validation error
> -----------------------------------------------------------------------------------------------
>
> Key: CALCITE-4512
> URL: https://issues.apache.org/jira/browse/CALCITE-4512
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.26.0
> Environment: jvm: open-jdk8
> Reporter: yanjing.wang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> String sql = "select replace(name, 'a', 'b') as name from users group by
> replace(name, 'a', 'b')";
>
> when group by expression has argument name same with select list item alias,
> the group by argument will be expanded to select list item when sql
> conformance supports 'groupByAlias', so the above sql will be expanded to
> String sql = "select replace(name, 'a', 'b') as name from users group by
> replace(replace(name, 'a', 'b'), 'a', 'b')";
>
> this is unexpected.
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