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From sureshsubbiah <...@git.apache.org>
Subject [GitHub] incubator-trafodion pull request #639: [TRAFODION-2117] add SQL support of E...
Date Fri, 05 Aug 2016 22:27:09 GMT
Github user sureshsubbiah commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/639#discussion_r73768268
  
    --- Diff: core/sql/optimizer/RelExpr.cpp ---
    @@ -6630,6 +6630,23 @@ const NAString Intersect::getText() const
     }
     
     // -----------------------------------------------------------------------
    +// // member functions for class Except
    +// // -----------------------------------------------------------------------
    +Except::Except(RelExpr *leftChild,
    +             RelExpr *rightChild)
    +: RelExpr(REL_EXCEPT, leftChild, rightChild)
    +{ setNonCacheable(); }
    --- End diff --
    
    Why is this noncacheable?
    Also please check if we can do showshape on a statement with EXCEPT


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