private static void AnalyzeRelationalOpNode(ExprRelationalOpNode relNode, QueryGraph queryGraph)
{
if (((relNode.ChildNodes[0] is ExprIdentNode)) &&
((relNode.ChildNodes[1] is ExprIdentNode)))
{
var identNodeLeft = (ExprIdentNode)relNode.ChildNodes[0];
var identNodeRight = (ExprIdentNode)relNode.ChildNodes[1];
if (identNodeLeft.StreamId != identNodeRight.StreamId)
{
queryGraph.AddRelationalOpStrict(
identNodeLeft.StreamId, identNodeLeft,
identNodeRight.StreamId, identNodeRight,
relNode.RelationalOpEnum);
}
return;
}
var indexedStream = -1;
ExprIdentNode indexedPropExpr = null;
ExprNode exprNodeNoIdent = null;
RelationalOpEnum relop = relNode.RelationalOpEnum;
if (relNode.ChildNodes[0] is ExprIdentNode)
{
indexedPropExpr = (ExprIdentNode)relNode.ChildNodes[0];
indexedStream = indexedPropExpr.StreamId;
exprNodeNoIdent = relNode.ChildNodes[1];
}
else if (relNode.ChildNodes[1] is ExprIdentNode)
{
indexedPropExpr = (ExprIdentNode)relNode.ChildNodes[1];
indexedStream = indexedPropExpr.StreamId;
exprNodeNoIdent = relNode.ChildNodes[0];
relop = relop.Reversed();
}
if (indexedStream == -1)
{
return; // require property of right/left side of equals
}
var eligibility = EligibilityUtil.VerifyInputStream(exprNodeNoIdent, indexedStream);
if (!eligibility.Eligibility.IsEligible())
{
return;
}
queryGraph.AddRelationalOp(indexedStream, indexedPropExpr, eligibility.StreamNum, exprNodeNoIdent, relop);
}
