private LanguageNode handleAndFunction(FunctionCall fc) {
// and functions take incomplete simple parts and turn them into complete parts, if so desired
ArrayList<Part> incompletes = new ArrayList<Part>();
ArrayList<ExpressionNode> ok = new ArrayList<ExpressionNode>();
ArrayList<Part> subparts = new ArrayList<Part>();
for (ExpressionNode en : fc.getParameters()) {
Part p = state.get(en);
if (p == null || p.isComplete()) {
ok.add(en);
if (p != null) subparts.add(p);
continue;
}
incompletes.add(p);
}
if (incompletes.isEmpty()) return fc;
// now we have the problem of a mishmash of incompletes. some may be complex, some may be
// simple
// some may be collections. we need to handle cases like the following:
// (a = 1) and (b = 2) {a,b} (1 key)
// (a = 1) and (b = 2 or b = 3) {a,b} (2 keys)
// (a = 1 or a = 2) and (b = 3) {a,b} (2 keys)
// (a = 1 or a = 2) and (b = 3 or b = 4) {a,b} (4 keys here)
// all of the above, where the result is still not complete due to missing tenant column
MultiMap<Part, ColumnKey> needed = new MultiMap<Part, ColumnKey>();
MultiMap<ColumnKey, Part> classified = new MultiMap<ColumnKey, Part>();
for (Part p : incompletes) {
ListSet<ColumnKey> has = new ListSet<ColumnKey>();
has.addAll(p.getColumns());
needed.putAll(p, parent.getNeeded(has));
for (ColumnKey ck : has) {
classified.put(ck, p);
}
}
// so let's say we have a part that is (a = 1 and b = 2), needs c and tenant, and we have a
// part
// that is c in (1,2,3). The needed for (a = 1 and b = 2) is {c,tenant}. we'll pull (c in
// (1,2,3))
// so we'll get at least (a = 1 and b = 2 and c = 3) or (a = 1 and b =2 and c = 3) ...
// these we can then individually try to complete.
while (!needed.isEmpty()) {
combineParts(needed, classified, ok, subparts);
}
for (Part p : subparts) state.put(p.getParent(), p);
if (ok.size() == 1) return ok.get(0);
else {
// what's left is a mix of unrelated and complete or incomplete subexprs. unrelated nodes
// would come in from above, as would previously complete.
return new FunctionCall(FunctionName.makeAnd(), ok);
}
}
@Override
public boolean isComplete() {
for (Part p : parts) if (!p.isComplete()) return false;
return true;
}