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