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https://issues.apache.org/jira/browse/DRILL-1943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Hsuan-Yi Chu updated DRILL-1943:
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Fix Version/s: (was: 0.9.0)
0.8.0
> Handle aliases and column names that differ in case only
> --------------------------------------------------------
>
> Key: DRILL-1943
> URL: https://issues.apache.org/jira/browse/DRILL-1943
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Parth Chandra
> Assignee: Sean Hsuan-Yi Chu
> Fix For: 0.8.0
>
>
> 1) Consider the query
> select a, a from foo.
> For this query we return the columns a and a0.
> For the query
> select a, A from foo
> we return only one column and also leak memory. (see DRILL-1911).
> The same behaviour exists if the query uses aliases. This is not correct.
> Aliases are explicitly specified names to remove ambiguity in column names
> and should be unique (ignoring case).
> A query like :
> select A as a1, B as A1 from foo
> should give a syntax error.
> This should be the behaviour in subqueries, view creation and CTAS queries as
> well.
> 2) If a subquery (or view) has column names that are different only in case,
> the use of the subquery or view should result in ann error if the top level
> query references the ambiguous column.
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