tuple_cell.cpp

#include "sql/expr/tuple_cell.h"
#include "storage/common/field.h"
#include "common/log/log.h"
#include "util/comparator.h"

void TupleCell::to_string(std::ostream &os) const
{
  switch (attr_type_) {
  case INTS: {
    os << *(int *)data_;
  } break;
  case FLOATS: {
    os << *(float *)data_;
  } break;
  case CHARS: {
    for (int i = 0; i < 4; i++) { // the max length of CHARS is 4
      if (data_[i] == '\0') {
	break;
      }
      os << data_[i];
    }
  } break;
  default: {
    LOG_WARN("unsupported attr type: %d", attr_type_);
  } break;
  }
}

int TupleCell::compare(const TupleCell &other) const
{
  if (this->attr_type_ == other.attr_type_) {
    switch (this->attr_type_) {
    case INTS: return compare_int(this->data_, other.data_);
    case FLOATS: return compare_float(this->data_, other.data_);
    case CHARS: return compare_string(this->data_, other.data_, 4);
    default: {
      LOG_WARN("unsupported type: %d", this->attr_type_);
    }
    }
  } else if (this->attr_type_ == INTS && other.attr_type_ == FLOATS) {
    float this_data = *(int *)data_;
    return compare_float(&this_data, other.data_);
  } else if (this->attr_type_ == FLOATS && other.attr_type_ == INTS) {
    float other_data = *(int *)other.data_;
    return compare_float(data_, &other_data);
  }
  LOG_WARN("not supported");
  return -1; // TODO return rc?
}