package water.rapids.ast.prims.mungers;
import water.MRTask;
import water.fvec.*;
import water.rapids.Env;
import water.rapids.Val;
import water.rapids.ast.AstRoot;
import water.rapids.vals.ValFrame;
import water.rapids.ast.AstPrimitive;
/**
* Remove rows with NAs from the H2OFrame
* Note: Current implementation is NOT in-place replacement
*/
public class AstNaOmit extends AstPrimitive {
@Override
public String[] args() {
return new String[]{"ary"};
}
@Override
public String str() {
return "na.omit";
}
@Override
public int nargs() {
return 1 + 1;
}
@Override
public ValFrame apply(Env env, Env.StackHelp stk, AstRoot asts[]) {
Frame fr = stk.track(asts[1].exec(env)).getFrame();
Frame fr2 = new MRTask() {
private void copyRow(int row, Chunk[] cs, NewChunk[] ncs) {
for (int i = 0; i < cs.length; ++i) {
if (cs[i] instanceof CStrChunk) ncs[i].addStr(cs[i], row);
else if (cs[i] instanceof C16Chunk) ncs[i].addUUID(cs[i], row);
else if (cs[i].hasFloat()) ncs[i].addNum(cs[i].atd(row));
else ncs[i].addNum(cs[i].at8(row), 0);
}
}
@Override
public void map(Chunk[] cs, NewChunk[] ncs) {
int col;
for (int row = 0; row < cs[0]._len; ++row) {
for (col = 0; col < cs.length; ++col)
if (cs[col].isNA(row)) break;
if (col == cs.length) copyRow(row, cs, ncs);
}
}
}.doAll(fr.types(), fr).outputFrame(fr.names(), fr.domains());
return new ValFrame(fr2);
}
}