private Object[] modifyIterDefToSuiteIMQ(CompiledIteratorDef iterDef)
      throws IndexInvalidException {
    Object[] retValues = {null, null};
    try {
      CompiledValue def = iterDef.getCollectionExpr();
      if (def instanceof CompiledRegion) {
        CompiledBindArgument bindArg = new CompiledBindArgument(1);
        CompiledIteratorDef newDef = new CompiledIteratorDef(iterDef.getName(), null, bindArg);
        retValues[0] = def.evaluate(context);
        retValues[1] = newDef;
        return retValues;
      }

      if (def instanceof CompiledPath || def instanceof CompiledOperation
          || def instanceof CompiledIndexOperation) {
        CompiledValue cv = def;
        List reconstruct = new ArrayList();

        while (!(cv instanceof CompiledRegion)) {
          CompiledValue prevCV = cv;
          if (cv instanceof CompiledOperation) {
            reconstruct.add(0, ((CompiledOperation) cv).getArguments());
            reconstruct.add(0, ((CompiledOperation) cv).getMethodName());
            cv = ((CompiledOperation) cv).getReceiver(context);
          } else if (cv instanceof CompiledPath) {
            reconstruct.add(0, ((CompiledPath) cv).getTailID());
            cv = cv.getReceiver();
          } else if (cv instanceof CompiledIndexOperation) {
            reconstruct.add(0, ((CompiledIndexOperation) cv).getExpression());
            cv = cv.getReceiver();
          } else {
            throw new IndexInvalidException(
                "FunctionalIndexCreationHelper::prepareFromClause:From clause is neither a CompiledPath nor CompiledOperation");
          }
          reconstruct.add(0, prevCV.getType());
        }

        CompiledValue v = cv;
        cv = new CompiledBindArgument(1);
        int len = reconstruct.size();
        for (int j = 0; j < len; ++j) {
          Object obj = reconstruct.get(j);
          if (obj instanceof Integer) {
            int tokenType = (Integer) obj;
            if (tokenType == CompiledValue.PATH) {
              cv = new CompiledPath(cv, (String) reconstruct.get(++j));
            } else if (tokenType == OQLLexerTokenTypes.TOK_LBRACK) {
              cv = new CompiledIndexOperation(cv, (CompiledValue) reconstruct.get(++j));
            } else if (tokenType == OQLLexerTokenTypes.METHOD_INV) {
              cv = new CompiledOperation(cv, (String) reconstruct.get(++j),
                  (List) reconstruct.get(++j));
            }
          }
        }

        CompiledIteratorDef newDef = new CompiledIteratorDef(iterDef.getName(), null, cv);
        retValues[0] = v.evaluate(context);
        retValues[1] = newDef;
        return retValues;
      }
    } catch (Exception e) {
      throw new IndexInvalidException(e);
    }
    return retValues;
  }
This function is modified so that if the indexed expression has any dependency on the 0th
iterator, then it needs to modified by using the missing link so that it is derivable from the
0th iterator.
<p>
TODO: refactor large method prepareIndexExpression
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/FunctionalIndexCreationHelper.java