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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