[jira] [Commented] (IMPALA-11036) CTAS throw AnalysisException Duplicate column name when subquery contains same query without alias

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

    [ https://issues.apache.org/jira/browse/IMPALA-11036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448570#comment-17448570 ] 

Sheng Wang commented on IMPALA-11036:
-------------------------------------

Hi [~stigahuang] and [~boroknagyz], is it designed like this deliberately or just a bug?

> CTAS throw AnalysisException Duplicate column name when subquery contains same query without alias
> --------------------------------------------------------------------------------------------------
>
>                 Key: IMPALA-11036
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11036
>             Project: IMPALA
>          Issue Type: Question
>            Reporter: Sheng Wang
>            Priority: Minor
>
> Hi, recently I found that CTAS will throw AnalysisException Duplicate column name when subquery contains same query without alias like this:
> {code:java}
> create table t3 as select * from (select ds,c1 from t1 ) t1 join (select ds,c2 from t2 ) t2 on t1.ds=t2.ds;
> {code}
> Even if we use 't1.ds' and 't2.ds', also same exception, unless we use alias in subquery, such as 'ds as t1_ds' and 'ds as t2_ds'. The main reason is when get 'colLabels_' in SelectStmt, Impala get column label like this: 
> {code:java}
>   public String toColumnLabel(int selectListPos, boolean useHiveColLabels) {
>     if (alias_ != null) return alias_.toLowerCase();
>     if (expr_ instanceof SlotRef) {
>       SlotRef slotRef = (SlotRef) expr_;
>       return Joiner.on(".").join(slotRef.getResolvedPath().getRawPath());
>     }
>     ......
> {code}



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