}
else
{
outerJoinDesc = outerJoinDescList.get(toStream - 1);
}
outerJoinExpr = outerJoinDesc.makeExprNode(exprEvaluatorContext);
}
if (historicalStreamIndexLists[toStream] == null)
{
historicalStreamIndexLists[toStream] = new HistoricalStreamIndexList(toStream, typesPerStream, queryGraph);