/**
* Converts an array of {@link RexNode} to an array of {@link Integer}. Every node must be a
* {@link RexLocalRef}.
*/
public static Integer[] toOrdinalArray(RexNode[] rexNodes) {
Integer[] orderKeys = new Integer[rexNodes.length];
for (int i = 0; i < orderKeys.length; i++) {
RexLocalRef inputRef = (RexLocalRef) rexNodes[i];
orderKeys[i] = inputRef.getIndex();
}
return orderKeys;
}
public Void visitLocalRef(RexLocalRef inputRef) {
super.visitLocalRef(inputRef);
if (inputRef.getIndex() >= limit) {
throw new IllegalForwardRefException();
}
return null;
}