Postfix for #8113: UNION ALL optimization with constant false condition. Thanks to Adriano.

Author: dyemanov

src/jrd/optimizer/Optimizer.cpp

@@ -834,6 +834,7 @@ RecordSource* Optimizer::compile(BoolExprNodeStack* parentStack)
 for (auto iter = getConjuncts(); iter.hasData(); ++iter)
 {
 if (!(iter & CONJUNCT_USED) &&
+!(iter->nodFlags & ExprNode::FLAG_RESIDUAL) &&
 iter->deterministic() &&
 iter->computable(csb, INVALID_STREAM, false))
 {