76f342f2e83c8db9ac6b43dc5354b55b74a5eebe,h2o-core/src/main/java/water/currents/ASTColSlice.java,ASTRowSliceAssign,apply,#Env#Env.StackHelp#AST#,83

Before Change


    Frame dst = stk.track(asts[1].exec(env)).getFrame();

    // Sanity check src vs dst
    Frame src = stk.track(asts[2].exec(env)).getFrame();
    if( dst.numCols() != src.numCols() )
      throw new IllegalArgumentException("Source and destination frames must have the same count and type of columns");
    Vec[] dvecs = dst.vecs();

After Change


    long nrows = nlist.cnt();

    // Sanity check src vs dst.
    Val vsrc = stk.track(asts[2].exec(env));
    if( vsrc.isFrame() ) {      // Frame vs Frame 
      Frame src = vsrc.getFrame();
      if( dst.numCols() != src.numCols() )