Fix #8926: Indexes may not be used for multiple ORed conditions containing both field and non-field references

Author: dyemanov

src/jrd/optimizer/Retrieval.cpp

@@ -1623,6 +1623,7 @@ InversionCandidate* Retrieval::makeInversion(InversionCandidateList& inversions)
 
 					if (bestCandidate->condition)
 					{
+						bestCandidate->used = true;
 						bestCandidate = currentInv;
 						restartLoop = true;
 						break;