[jira] [Created] (MRQL-81) Fix the coercion of persistent collections to in-memory bags

["Leonidas Fegaras (JIRA)" <ji...@apache.org>]

Leonidas Fegaras created MRQL-81:
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             Summary: 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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