9b69d5c1da
When converting an RTE with securityQuals into a security barrier subquery RTE, ensure that the Vars in the new subquery's targetlist all have varlevelsup = 0 so that they correctly refer to the underlying base relation being wrapped. The original code was creating new Vars by copying them from existing Vars referencing the base relation found elsewhere in the query, but failed to account for the fact that such Vars could come from sublink subqueries, and hence have varlevelsup > 0. In practice it looks like this could only happen with nested security barrier views, where the outer view has a WHERE clause containing a correlated subquery, due to the order in which the Vars are processed. Bug: #13988 Reported-by: Adam Guthrie Backpatch-to: 9.4, where updatable SB views were introduced
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