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https://issues.apache.org/jira/browse/VXQUERY-147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590936#comment-14590936
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Preston Carman commented on VXQUERY-147:
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For Q10, I believe the issue is because of the distinct-values function.
- First the ASSIGN distinct-values separates the UNNEST operator from the
SUBPLAN with an AGGREGATE sequence expression.
- Second the ASSIGN distinct-values expression could be translated to a more
efficient parallel DISTINCT operator.
The solution for this query needs some discussion. What is the correct plan
translation of distinct-values? Can the distinct values be moved in the query
plan (say below the unnest operator).
> [ERROR] Rewrite Rule for Collection
> -----------------------------------
>
> Key: VXQUERY-147
> URL: https://issues.apache.org/jira/browse/VXQUERY-147
> Project: VXQuery
> Issue Type: Bug
> Reporter: Shivani Mall
> Labels: gsoc2015, xmark
> Attachments: collectn_rr_q10_q14.txt
>
>
> There is some error in the subplan while dealing with the rewrite rule for
> collection. This makes XMark queries 10 and 14 to fail.
> Error and Optimized Query plans for both the queries attached.
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