[jira] [Created] (LENS-473) Change the queryable field validation logic

["Amareshwari Sriramadasu (JIRA)" <ji...@apache.org>]

Amareshwari Sriramadasu created LENS-473:
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             Summary: Change the queryable field validation logic
                 Key: LENS-473
                 URL: https://issues.apache.org/jira/browse/LENS-473
             Project: Apache Lens
          Issue Type: Improvement
          Components: cube
    Affects Versions: 2.1
            Reporter: Amareshwari Sriramadasu
            Priority: Critical
             Fix For: 2.1


Right now the field validation logic at https://github.com/apache/incubator-lens/blob/master/lens-cube/src/main/java/org/apache/lens/cube/parse/AliasReplacer.java#L103 does the following :

It gets all the dim-attributes queried and measures queried in the user query (after expressions are expanded), then it finds if there is single derived cube having all the attributes queried and any of measures queried. And makes sure all the measures queried are covered by attribute covering derived cubes. For chain attributes, it picks source columns of chains as the dim-attributes in the above validate.

Instead it should do the following :
* Do validation only when query has aggregates
* Pick dim-attributes (or chain ref columns) only if they are not part of aggregate expression.
* Above mentioned logic of attribute covering and measuring covering logic would be the same.



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