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https://issues.apache.org/jira/browse/DRILL-6431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16483419#comment-16483419
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ASF GitHub Bot commented on DRILL-6431:
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HanumathRao commented on issue #1277: DRILL-6431: Unnest operator requires
table and a single column alias
URL: https://github.com/apache/drill/pull/1277#issuecomment-390843003
@amansinha100 Thank you for the review. Done the changes.
@sohami I have done the required refactoring of the code. Please do let me
know if it is fine.
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> Unnest operator requires table and a single column alias to be specified.
> -------------------------------------------------------------------------
>
> Key: DRILL-6431
> URL: https://issues.apache.org/jira/browse/DRILL-6431
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization, SQL Parser
> Reporter: Hanumath Rao Maduri
> Assignee: Hanumath Rao Maduri
> Priority: Major
> Fix For: 1.14.0
>
>
> Currently, unnest operator is not required to specify alias neither for table
> name nor column name. This has some implications on what name the unnest
> operator output column should use. One can use a common name like "unnest" as
> the output name. It means, customers need to be educated on what to expect
> from unnest operator. This might confuse some customers and also prone to
> introduce errors in the query.
> The design decision for DRILL is that unnest always produces either a scalar
> column or a map (depending upon the input schema for it), but it is always a
> single column.
> Given this scenario, it is better to enforce the requirement that unnest
> operator requires a table alias and a column alias(single column). This can
> help to disambiguate the column and further can easily be referenced in the
> query.
>
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