public RexNode visitFieldAccess(RexFieldAccess fieldAccess) {
final RexNode expr = fieldAccess.getReferenceExpr();
expr.accept(this);
final RexNode normalizedExpr = lookup(expr);
if (normalizedExpr != expr) {
fieldAccess = new RexFieldAccess(normalizedExpr, fieldAccess.getField());
}
return register(fieldAccess);
}
public JavaRel findRel(JavaRel rel, RexNode expression) {
if (expression instanceof RexInputRef) {
RexInputRef variable = (RexInputRef) expression;
// REVIEW jvs 30-May-2005: What's up with this? The "&& false"
// should have at least a comment!
if ((rel instanceof JoinRelBase) && false) {
return (JavaRel) findInputRel(rel, variable.getIndex());
} else {
return (JavaRel) rel.getInput(variable.getIndex());
}
} else if (expression instanceof RexFieldAccess) {
RexFieldAccess fieldAccess = (RexFieldAccess) expression;
String fieldName = fieldAccess.getName();
RexNode refExp = fieldAccess.getReferenceExpr();
JavaRel rel2 = findRel(rel, refExp); // recursive
if (rel2 == null) {
return null;
}
return implementFieldAccess(rel2, fieldName);
} else {
return null;
}
}