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https://issues.apache.org/jira/browse/MRQL-81?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137548#comment-15137548
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ASF GitHub Bot commented on MRQL-81:
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Github user asfgit closed the pull request at:
https://github.com/apache/incubator-mrql/pull/13
> Fix the coercion of persistent collections to in-memory bags
> -------------------------------------------------------------
>
> Key: MRQL-81
> URL: https://issues.apache.org/jira/browse/MRQL-81
> Project: MRQL
> Issue Type: Bug
> Components: Run-Time/Flink, Run-Time/MapReduce, Run-Time/Spark
> Affects Versions: 0.9.6
> Reporter: Leonidas Fegaras
> Assignee: Leonidas Fegaras
> Priority: Critical
>
> Currently, query results that are persistent bags (such as Spark RDDs or
> Flink DataSets) are coerced to in-memory bags before they are printed. This
> needs to be done at any place in the query result. This came out when we used
> matrix factorization (query/factorization.mrql) because its output are the
> two matrix factors (datasets) in a tuple. It was reported by Ahmed Ulde. It
> will be fixed by adding a new case for tuple projection in the query
> evaluator that coerces persistent datasets to bags when they appear in the
> query output.
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