private JavaFrame findFrame() {
RelNode previous = rel;
while (true) {
JavaFrame frame = (JavaFrame) mapRel2Frame.get(previous);
if (frame.bind != null) {
tracer.log(
Level.FINE,
"Bind " + rel.toString() + " to " + previous.toString() + "(" + frame.bind + ")");
return frame;
}
// go deeper
List<RelNode> inputs = previous.getInputs();
assert (inputs.size() == 1) : "input is not bound";
previous = inputs.get(0);
}
}
/**
* Records the fact that instances of <code>rel</code> are available via <code>bind</code> (which
* may be eager or lazy).
*/
private void bind(RelNode rel, Bind bind) {
tracer.log(Level.FINE, "Bind " + rel.toString() + " to " + bind);
JavaFrame frame = (JavaFrame) mapRel2Frame.get(rel);
frame.bind = bind;
boolean stupid = SaffronProperties.instance().stupid.get();
if (stupid) {
// trigger the declaration of the variable, even though it
// may not be used
Util.discard(bind.getVariable());
}
}