fdo#79427 after execute() a ResultSet is expected to be BeforeFirst

Change-Id: I38091d1ee2161d6e32da3a0bde60e3fc008aa83d
Reviewed-on: https://gerrit.libreoffice.org/9794Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Lionel Elie Mamane <lionel@mamane.lu>

dbaccess/source/core/api/RowSet.cxx

@@ -2740,6 +2740,7 @@ void ORowSet::impl_rebuild_throw(::osl::ResettableMutexGuard& _rGuard)
     {
         xResultSet = m_xStatement->executeQuery();
         m_pCache->reset(xResultSet);
+        beforeFirst();
     }
     m_aWarnings.setExternalWarnings( Reference< XWarningsSupplier >( xResultSet, UNO_QUERY ) );
     notifyAllListeners(_rGuard);