Field *make_field(TABLE_SHARE *share,
                  MEM_ROOT *mem_root,
                  uchar *ptr, uint32 field_length,
		  uchar *null_pos, uchar null_bit,
		  uint pack_flag,
		  enum_field_types field_type,
		  CHARSET_INFO *field_charset,
		  Field::geometry_type geom_type, uint srid,
		  Field::utype unireg_check,
		  TYPELIB *interval,
		  const char *field_name)
{
  uchar *UNINIT_VAR(bit_ptr);
  uchar UNINIT_VAR(bit_offset);

  if (field_type == MYSQL_TYPE_BIT && !f_bit_as_char(pack_flag))
  {
    bit_ptr= null_pos;
    bit_offset= null_bit;
    if (f_maybe_null(pack_flag))         // if null field
    {
       bit_ptr+= (null_bit == 7);        // shift bit_ptr and bit_offset
       bit_offset= (bit_offset + 1) & 7;
    }
  }

  if (!f_maybe_null(pack_flag))
  {
    null_pos=0;
    null_bit=0;
  }
  else
  {
    null_bit= ((uchar) 1) << null_bit;
  }

  DBUG_PRINT("debug", ("field_type: %d, field_length: %u, interval: %p, pack_flag: %s%s%s%s%s",
                       field_type, field_length, interval,
                       FLAGSTR(pack_flag, FIELDFLAG_BINARY),
                       FLAGSTR(pack_flag, FIELDFLAG_INTERVAL),
                       FLAGSTR(pack_flag, FIELDFLAG_NUMBER),
                       FLAGSTR(pack_flag, FIELDFLAG_PACK),
                       FLAGSTR(pack_flag, FIELDFLAG_BLOB)));

  if (f_is_alpha(pack_flag))
  {
    if (!f_is_packed(pack_flag))
    {
      if (field_type == MYSQL_TYPE_STRING ||
          field_type == MYSQL_TYPE_DECIMAL ||   // 3.23 or 4.0 string
          field_type == MYSQL_TYPE_VAR_STRING)
        return new (mem_root)
          Field_string(ptr,field_length,null_pos,null_bit,
                       unireg_check, field_name,
                       field_charset);
      if (field_type == MYSQL_TYPE_VARCHAR)
        return new (mem_root)
          Field_varstring(ptr,field_length,
                          HA_VARCHAR_PACKLENGTH(field_length),
                          null_pos,null_bit,
                          unireg_check, field_name,
                          share,
                          field_charset);
      return 0;                                 // Error
    }

    uint pack_length=calc_pack_length((enum_field_types)
				      f_packtype(pack_flag),
				      field_length);

#ifdef HAVE_SPATIAL
    if (f_is_geom(pack_flag))
    {
      status_var_increment(current_thd->status_var.feature_gis);
      return new (mem_root)
        Field_geom(ptr,null_pos,null_bit,
                   unireg_check, field_name, share,
                   pack_length, geom_type, srid);
    }
#endif
    if (f_is_blob(pack_flag))
      return new (mem_root)
        Field_blob(ptr,null_pos,null_bit,
                   unireg_check, field_name, share,
                   pack_length, field_charset);
    if (interval)
    {
      if (f_is_enum(pack_flag))
	return new (mem_root)
          Field_enum(ptr,field_length,null_pos,null_bit,
                     unireg_check, field_name,
                     pack_length, interval, field_charset);
      else
	return new (mem_root)
          Field_set(ptr,field_length,null_pos,null_bit,
                    unireg_check, field_name,
                    pack_length, interval, field_charset);
    }
  }

  switch (field_type) {
  case MYSQL_TYPE_DECIMAL:
    return new (mem_root)
      Field_decimal(ptr,field_length,null_pos,null_bit,
                    unireg_check, field_name,
                    f_decimals(pack_flag),
                    f_is_zerofill(pack_flag) != 0,
                    f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_NEWDECIMAL:
    return new (mem_root)
      Field_new_decimal(ptr,field_length,null_pos,null_bit,
                        unireg_check, field_name,
                        f_decimals(pack_flag),
                        f_is_zerofill(pack_flag) != 0,
                        f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_FLOAT:
  {
    int decimals= f_decimals(pack_flag);
    if (decimals == FLOATING_POINT_DECIMALS)
      decimals= NOT_FIXED_DEC;
    return new (mem_root)
      Field_float(ptr,field_length,null_pos,null_bit,
                  unireg_check, field_name,
                  decimals,
                  f_is_zerofill(pack_flag) != 0,
                  f_is_dec(pack_flag)== 0);
  }
  case MYSQL_TYPE_DOUBLE:
  {
    int decimals= f_decimals(pack_flag);
    if (decimals == FLOATING_POINT_DECIMALS)
      decimals= NOT_FIXED_DEC;
    return new (mem_root)
      Field_double(ptr,field_length,null_pos,null_bit,
                   unireg_check, field_name,
                   decimals,
                   f_is_zerofill(pack_flag) != 0,
                   f_is_dec(pack_flag)== 0);
  }
  case MYSQL_TYPE_TINY:
    return new (mem_root)
      Field_tiny(ptr,field_length,null_pos,null_bit,
                 unireg_check, field_name,
                 f_is_zerofill(pack_flag) != 0,
                 f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_SHORT:
    return new (mem_root)
      Field_short(ptr,field_length,null_pos,null_bit,
                  unireg_check, field_name,
                  f_is_zerofill(pack_flag) != 0,
                  f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_INT24:
    return new (mem_root)
      Field_medium(ptr,field_length,null_pos,null_bit,
                   unireg_check, field_name,
                   f_is_zerofill(pack_flag) != 0,
                   f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_LONG:
    return new (mem_root)
      Field_long(ptr,field_length,null_pos,null_bit,
                 unireg_check, field_name,
                 f_is_zerofill(pack_flag) != 0,
                 f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_LONGLONG:
    return new (mem_root)
      Field_longlong(ptr,field_length,null_pos,null_bit,
                     unireg_check, field_name,
                     f_is_zerofill(pack_flag) != 0,
                     f_is_dec(pack_flag) == 0);
  case MYSQL_TYPE_TIMESTAMP:
  {
    uint dec= field_length > MAX_DATETIME_WIDTH ?
                       field_length - MAX_DATETIME_WIDTH - 1: 0;
    return new_Field_timestamp(mem_root, ptr, null_pos, null_bit, unireg_check,
                               field_name, share, dec);
  }
  case MYSQL_TYPE_TIMESTAMP2:
  {
    uint dec= field_length > MAX_DATETIME_WIDTH ?
                       field_length - MAX_DATETIME_WIDTH - 1: 0;
    return new (mem_root)
      Field_timestampf(ptr, null_pos, null_bit, unireg_check,
                       field_name, share, dec);
  }
  case MYSQL_TYPE_YEAR:
    return new (mem_root)
      Field_year(ptr,field_length,null_pos,null_bit,
                 unireg_check, field_name);
  case MYSQL_TYPE_DATE:
    return new (mem_root)
      Field_date(ptr,null_pos,null_bit,
                 unireg_check, field_name);
  case MYSQL_TYPE_NEWDATE:
    return new (mem_root)
      Field_newdate(ptr,null_pos,null_bit,
                    unireg_check, field_name);
  case MYSQL_TYPE_TIME:
  {
    uint dec= field_length > MIN_TIME_WIDTH ?
                       field_length - MIN_TIME_WIDTH - 1: 0;
    return new_Field_time(mem_root, ptr, null_pos, null_bit, unireg_check,
                          field_name, dec);
  }
  case MYSQL_TYPE_TIME2:
  {
    uint dec= field_length > MIN_TIME_WIDTH ?
                       field_length - MIN_TIME_WIDTH - 1: 0;
    return new (mem_root)
      Field_timef(ptr, null_pos, null_bit, unireg_check,
                  field_name, dec);
  }
  case MYSQL_TYPE_DATETIME:
  {
    uint dec= field_length > MAX_DATETIME_WIDTH ?
                       field_length - MAX_DATETIME_WIDTH - 1: 0;
    return new_Field_datetime(mem_root, ptr, null_pos, null_bit, unireg_check,
                              field_name, dec);
  }
  case MYSQL_TYPE_DATETIME2:
  {
    uint dec= field_length > MAX_DATETIME_WIDTH ?
                       field_length - MAX_DATETIME_WIDTH - 1: 0;
    return new (mem_root)
      Field_datetimef(ptr, null_pos, null_bit, unireg_check,
                      field_name, dec);
  }
  case MYSQL_TYPE_NULL:
    return new (mem_root)
      Field_null(ptr, field_length, unireg_check, field_name,
                 field_charset);
  case MYSQL_TYPE_BIT:
    return (f_bit_as_char(pack_flag) ?
            new (mem_root)
            Field_bit_as_char(ptr, field_length, null_pos, null_bit,
                              unireg_check, field_name) :
            new (mem_root)
            Field_bit(ptr, field_length, null_pos, null_bit, bit_ptr,
                      bit_offset, unireg_check, field_name));

  default:					// Impossible (Wrong version)
    break;
  }
  return 0;
}