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https://issues.apache.org/jira/browse/DRILL-7348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947798#comment-16947798
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Keith G Yu commented on DRILL-7348:
-----------------------------------
It is entirely possible the error was due to using a reserved keyword as a
column name. I had rewritten it for posting here but cannot recall whether
`date` was originally in the column names. Since I can't recall nor provide
the original data source used thank everyone for their attention and I'll close
the issue.
> Aggregate on Subquery with Select Distinct or UNION fails to Group By
> ---------------------------------------------------------------------
>
> Key: DRILL-7348
> URL: https://issues.apache.org/jira/browse/DRILL-7348
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Affects Versions: 1.15.0
> Reporter: Keith G Yu
> Priority: Major
>
> The following query fails to group properly.
> {code:java}
> SELECT date, COUNT(1)
> FROM (
> SELECT DISTINCT
> id,
> date,
> status
> FROM table(dfs.`path`(type => 'text', fieldDelimiter => ',',
> extractHeader => TRUE))
> )
> GROUP BY 1{code}
> This also fails to group properly.
> {code:java}
> SELECT date, COUNT(1)
> FROM (
> SELECT
> id,
> date,
> status
> FROM table(dfs.`path1`(type => 'text', fieldDelimiter => ',',
> extractHeader => TRUE))
> UNION
> SELECT
> id,
> date,
> status
> FROM table(dfs.`path2`(type => 'text', fieldDelimiter => ',',
> extractHeader => TRUE))
> )
> GROUP BY 1
> {code}
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