/**
* Analye EQUALS (=) node.
*
* @param equalsNode - node to analyze
* @param queryGraph - store relationships between stream properties
*/
protected static void analyzeEqualsNode(
ExprEqualsNode equalsNode, QueryGraph queryGraph, boolean isOuterJoin) {
if ((equalsNode.getChildNodes()[0] instanceof ExprIdentNode)
&& (equalsNode.getChildNodes()[1] instanceof ExprIdentNode)) {
ExprIdentNode identNodeLeft = (ExprIdentNode) equalsNode.getChildNodes()[0];
ExprIdentNode identNodeRight = (ExprIdentNode) equalsNode.getChildNodes()[1];
if (identNodeLeft.getStreamId() != identNodeRight.getStreamId()) {
queryGraph.addStrictEquals(
identNodeLeft.getStreamId(),
identNodeLeft.getResolvedPropertyName(),
identNodeLeft,
identNodeRight.getStreamId(),
identNodeRight.getResolvedPropertyName(),
identNodeRight);
}
return;
}
if (isOuterJoin) { // outerjoins don't use constants or one-way expression-derived information
// to evaluate join
return;
}
// handle constant-compare or transformation case
int indexedStream = -1;
String indexedProp = null;
ExprNode exprNodeNoIdent = null;
if (equalsNode.getChildNodes()[0] instanceof ExprIdentNode) {
ExprIdentNode identNode = (ExprIdentNode) equalsNode.getChildNodes()[0];
indexedStream = identNode.getStreamId();
indexedProp = identNode.getResolvedPropertyName();
exprNodeNoIdent = equalsNode.getChildNodes()[1];
} else if (equalsNode.getChildNodes()[1] instanceof ExprIdentNode) {
ExprIdentNode identNode = (ExprIdentNode) equalsNode.getChildNodes()[1];
indexedStream = identNode.getStreamId();
indexedProp = identNode.getResolvedPropertyName();
exprNodeNoIdent = equalsNode.getChildNodes()[0];
}
if (indexedStream == -1) {
return; // require property of right/left side of equals
}
EligibilityDesc eligibility = EligibilityUtil.verifyInputStream(exprNodeNoIdent, indexedStream);
if (!eligibility.getEligibility().isEligible()) {
return;
}
if (eligibility.getEligibility() == Eligibility.REQUIRE_NONE) {
queryGraph.addUnkeyedExpression(indexedStream, indexedProp, exprNodeNoIdent);
} else {
queryGraph.addKeyedExpression(
indexedStream, indexedProp, eligibility.getStreamNum(), exprNodeNoIdent);
}
}
private static void analyzeRelationalOpNode(ExprRelationalOpNode relNode, QueryGraph queryGraph) {
if (((relNode.getChildNodes()[0] instanceof ExprIdentNode))
&& ((relNode.getChildNodes()[1] instanceof ExprIdentNode))) {
ExprIdentNode identNodeLeft = (ExprIdentNode) relNode.getChildNodes()[0];
ExprIdentNode identNodeRight = (ExprIdentNode) relNode.getChildNodes()[1];
if (identNodeLeft.getStreamId() != identNodeRight.getStreamId()) {
queryGraph.addRelationalOpStrict(
identNodeLeft.getStreamId(),
identNodeLeft.getResolvedPropertyName(),
identNodeLeft,
identNodeRight.getStreamId(),
identNodeRight.getResolvedPropertyName(),
identNodeRight,
relNode.getRelationalOpEnum());
}
return;
}
int indexedStream = -1;
String indexedProp = null;
ExprNode exprNodeNoIdent = null;
RelationalOpEnum relop = relNode.getRelationalOpEnum();
if (relNode.getChildNodes()[0] instanceof ExprIdentNode) {
ExprIdentNode identNode = (ExprIdentNode) relNode.getChildNodes()[0];
indexedStream = identNode.getStreamId();
indexedProp = identNode.getResolvedPropertyName();
exprNodeNoIdent = relNode.getChildNodes()[1];
} else if (relNode.getChildNodes()[1] instanceof ExprIdentNode) {
ExprIdentNode identNode = (ExprIdentNode) relNode.getChildNodes()[1];
indexedStream = identNode.getStreamId();
indexedProp = identNode.getResolvedPropertyName();
exprNodeNoIdent = relNode.getChildNodes()[0];
relop = relop.reversed();
}
if (indexedStream == -1) {
return; // require property of right/left side of equals
}
EligibilityDesc eligibility = EligibilityUtil.verifyInputStream(exprNodeNoIdent, indexedStream);
if (!eligibility.getEligibility().isEligible()) {
return;
}
queryGraph.addRelationalOp(
indexedStream, indexedProp, eligibility.getStreamNum(), exprNodeNoIdent, relop);
}