@Override
public Info visitLeave(RowValueConstructorExpression node, List<Info> l) {
// Child expression returned null and was filtered, so not order preserving
if (l.size() != node.getChildren().size()) {
return null;
}
Info firstInfo = l.get(0);
Info lastInfo = firstInfo;
// Check that pkPos are consecutive which is the only way a RVC can be order preserving
for (int i = 1; i < l.size(); i++) {
// not order preserving since it's not last
if (lastInfo.orderPreserving == OrderPreserving.YES_IF_LAST) {
return null;
}
Info info = l.get(i);
// not order preserving since there's a gap in the pk
if (info.pkPosition != lastInfo.pkPosition + 1) {
return null;
}
lastInfo = info;
}
return new Info(firstInfo, l.size(), lastInfo.orderPreserving);
}
@Override
public Iterator<Expression> visitEnter(RowValueConstructorExpression node) {
return node.getChildren().iterator();
}