@Override
public void readFields(DataInput input) throws IOException {
super.readFields(input);
accessor = new RowKeyValueAccessor();
accessor.readFields(input);
fromType = type; // fromType only needed on client side
}
public void visit(ColumnExpression entity) {
wGetVisitor1().visit(entity.getExpression());
wGetVisitor1().visit(entity.getAlias());
}
@Override
public void write(DataOutput output) throws IOException {
super.write(output);
accessor.write(output);
}