package water.rapids.ast.prims.assign;
import water.*;
import water.fvec.Frame;
import water.rapids.Env;
import water.rapids.vals.ValFrame;
import water.rapids.ast.AstPrimitive;
import water.rapids.ast.AstRoot;
/**
* Assign a whole frame over a global. Copy-On-Write optimizations make this cheap.
*/
public class AstAssign extends AstPrimitive {
@Override
public String[] args() {
return new String[]{"id", "frame"};
}
@Override
public int nargs() {
return 1 + 2;
} // (assign id frame)
@Override
public String str() {
return "assign";
}
@Override
public ValFrame apply(Env env, Env.StackHelp stk, AstRoot asts[]) {
Key<Frame> id = Key.make(asts[1].str());
Frame src = stk.track(asts[2].exec(env)).getFrame();
return new ValFrame(env._ses.assign(id, src)); // New global Frame over shared Vecs
}
}