item_sum.cc 24.6 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
unknown's avatar
unknown committed
2

unknown's avatar
unknown committed
3 4 5 6
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
unknown's avatar
unknown committed
7

unknown's avatar
unknown committed
8 9 10 11
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
unknown's avatar
unknown committed
12

unknown's avatar
unknown committed
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* Sum functions (COUNT, MIN...) */

#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"


Item_sum::Item_sum(List<Item> &list)
{
  arg_count=list.elements;
  if ((args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
  {
    uint i=0;
unknown's avatar
unknown committed
33
    List_iterator_fast<Item> li(list);
unknown's avatar
unknown committed
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
    Item *item;

    while ((item=li++))
    {
      args[i++]= item;
    }
  }
  with_sum_func=1;
  list.empty();					// Fields are used
}


void Item_sum::make_field(Send_field *tmp_field)
{
  if (args[0]->type() == Item::FIELD_ITEM && keep_field_type())
    ((Item_field*) args[0])->field->make_field(tmp_field);
  else
  {
    tmp_field->flags=0;
    if (!maybe_null)
      tmp_field->flags|= NOT_NULL_FLAG;
55 56
    if (unsigned_flag)
      tmp_field->flags |= UNSIGNED_FLAG;
unknown's avatar
unknown committed
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
    tmp_field->length=max_length;
    tmp_field->decimals=decimals;
    tmp_field->type=(result_type() == INT_RESULT ? FIELD_TYPE_LONG :
		     result_type() == REAL_RESULT ? FIELD_TYPE_DOUBLE :
		     FIELD_TYPE_VAR_STRING);
  }
  tmp_field->table_name=(char*)"";
  tmp_field->col_name=name;
}

void Item_sum::print(String *str)
{
  str->append(func_name());
  str->append('(');
  for (uint i=0 ; i < arg_count ; i++)
  {
    if (i)
      str->append(',');
    args[i]->print(str);
  }
  str->append(')');
}

void Item_sum::fix_num_length_and_dec()
{
  decimals=0;
  for (uint i=0 ; i < arg_count ; i++)
    set_if_bigger(decimals,args[i]->decimals);
  max_length=float_length(decimals);
}


String *
Item_sum_num::val_str(String *str)
{
  double nr=val();
  if (null_value)
    return 0;
  str->set(nr,decimals);
  return str;
}


String *
Item_sum_int::val_str(String *str)
{
  longlong nr=val_int();
  if (null_value)
    return 0;
  char buff[21];
  uint length= (uint) (longlong10_to_str(nr,buff,-10)-buff);
  str->copy(buff,length);
  return str;
}


bool
Item_sum_num::fix_fields(THD *thd,TABLE_LIST *tables)
{
  if (!thd->allow_sum_func)
  {
    my_error(ER_INVALID_GROUP_FUNC_USE,MYF(0));
    return 1;
  }
  thd->allow_sum_func=0;			// No included group funcs
  decimals=0;
  maybe_null=0;
  for (uint i=0 ; i < arg_count ; i++)
  {
    if (args[i]->fix_fields(thd,tables))
      return 1;
    if (decimals < args[i]->decimals)
      decimals=args[i]->decimals;
    maybe_null |= args[i]->maybe_null;
  }
  result_field=0;
  max_length=float_length(decimals);
  null_value=1;
  fix_length_and_dec();
  thd->allow_sum_func=1;			// Allow group functions
  return 0;
}


bool
Item_sum_hybrid::fix_fields(THD *thd,TABLE_LIST *tables)
{
  Item *item=args[0];
  if (!thd->allow_sum_func)
  {
    my_error(ER_INVALID_GROUP_FUNC_USE,MYF(0));
    return 1;
  }
  thd->allow_sum_func=0;			// No included group funcs
  if (item->fix_fields(thd,tables))
    return 1;
  hybrid_type=item->result_type();
  if (hybrid_type == INT_RESULT)
155
    max_length=20;
unknown's avatar
unknown committed
156 157 158 159 160 161 162
  else if (hybrid_type == REAL_RESULT)
    max_length=float_length(decimals);
  else
    max_length=item->max_length;
  decimals=item->decimals;
  maybe_null=item->maybe_null;
  binary=item->binary;
163
  unsigned_flag=item->unsigned_flag;
unknown's avatar
unknown committed
164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328
  result_field=0;
  null_value=1;
  fix_length_and_dec();
  thd->allow_sum_func=1;			// Allow group functions
  return 0;
}


/***********************************************************************
** reset and add of sum_func
***********************************************************************/

void Item_sum_sum::reset()
{
  null_value=0; sum=0.0; Item_sum_sum::add();
}

bool Item_sum_sum::add()
{
  sum+=args[0]->val();
  return 0;
}

double Item_sum_sum::val()
{
  return sum;
}


void Item_sum_count::reset()
{
  count=0; add();
}

bool Item_sum_count::add()
{
  if (!args[0]->maybe_null)
    count++;
  else
  {
    (void) args[0]->val_int();
    if (!args[0]->null_value)
      count++;
  }
  return 0;
}

longlong Item_sum_count::val_int()
{
  return (longlong) count;
}

/*
** Avgerage
*/

void Item_sum_avg::reset()
{
  sum=0.0; count=0; Item_sum_avg::add();
}

bool Item_sum_avg::add()
{
  double nr=args[0]->val();
  if (!args[0]->null_value)
  {
    sum+=nr;
    count++;
  }
  return 0;
}

double Item_sum_avg::val()
{
  if (!count)
  {
    null_value=1;
    return 0.0;
  }
  null_value=0;
  return sum/ulonglong2double(count);
}


/*
** Standard deviation
*/

void Item_sum_std::reset()
{
  sum=sum_sqr=0.0; count=0; (void) Item_sum_std::add();
}

bool Item_sum_std::add()
{
  double nr=args[0]->val();
  if (!args[0]->null_value)
  {
    sum+=nr;
    sum_sqr+=nr*nr;
    count++;
  }
  return 0;
}

double Item_sum_std::val()
{
  if (!count)
  {
    null_value=1;
    return 0.0;
  }
  null_value=0;
  /* Avoid problems when the precision isn't good enough */
  double tmp=ulonglong2double(count);
  double tmp2=(sum_sqr - sum*sum/tmp)/tmp;
  return tmp2 <= 0.0 ? 0.0 : sqrt(tmp2);
}


void Item_sum_std::reset_field()
{
  double nr=args[0]->val();
  char *res=result_field->ptr;

  if (args[0]->null_value)
    bzero(res,sizeof(double)*2+sizeof(longlong));
  else
  {
    float8store(res,nr);
    nr*=nr;
    float8store(res+sizeof(double),nr);
    longlong tmp=1;
    int8store(res+sizeof(double)*2,tmp);
  }
}

void Item_sum_std::update_field(int offset)
{
  double nr,old_nr,old_sqr;
  longlong field_count;
  char *res=result_field->ptr;

  float8get(old_nr,res+offset);
  float8get(old_sqr,res+offset+sizeof(double));
  field_count=sint8korr(res+offset+sizeof(double)*2);

  nr=args[0]->val();
  if (!args[0]->null_value)
  {
    old_nr+=nr;
    old_sqr+=nr*nr;
    field_count++;
  }
  float8store(res,old_nr);
  float8store(res+sizeof(double),old_sqr);
  int8store(res+sizeof(double)*2,field_count);
}

/* min & max */

double Item_sum_hybrid::val()
{
  if (null_value)
    return 0.0;
329 330
  switch (hybrid_type) {
  case STRING_RESULT:
unknown's avatar
unknown committed
331 332
    String *res;  res=val_str(&str_value);
    return res ? atof(res->c_ptr()) : 0.0;
333 334 335 336 337 338
  case INT_RESULT:
    if (unsigned_flag)
      return ulonglong2double(sum_int);
    return (double) sum_int;
  case REAL_RESULT:
    return sum;
unknown's avatar
unknown committed
339
  }
340 341 342 343 344 345 346 347 348 349
  return 0;					// Keep compiler happy
}

longlong Item_sum_hybrid::val_int()
{
  if (null_value)
    return 0;
  if (hybrid_type == INT_RESULT)
    return sum_int;
  return (longlong) Item_sum_hybrid::val();
unknown's avatar
unknown committed
350 351 352 353 354 355 356 357
}


String *
Item_sum_hybrid::val_str(String *str)
{
  if (null_value)
    return 0;
358 359
  switch (hybrid_type) {
  case STRING_RESULT:
unknown's avatar
unknown committed
360
    return &value;
361 362 363 364 365 366 367 368 369 370 371
  case REAL_RESULT:
    str->set(sum,decimals);
    break;
  case INT_RESULT:
    if (unsigned_flag)
      str->set((ulonglong) sum_int);
    else
      str->set((longlong) sum_int);
    break;
  }
  return str;					// Keep compiler happy
unknown's avatar
unknown committed
372 373 374 375
}

bool Item_sum_min::add()
{
376 377
  switch (hybrid_type) {
  case STRING_RESULT:
unknown's avatar
unknown committed
378 379 380 381 382 383 384 385 386 387
  {
    String *result=args[0]->val_str(&tmp_value);
    if (!args[0]->null_value &&
	(null_value ||
	 (binary ? stringcmp(&value,result) : sortcmp(&value,result)) > 0))
    {
      value.copy(*result);
      null_value=0;
    }
  }
388 389 390 391 392 393 394 395 396 397 398 399 400 401 402
  break;
  case INT_RESULT:
  {
    longlong nr=args[0]->val_int();
    if (!args[0]->null_value && (null_value ||
				 (unsigned_flag && 
				  (ulonglong) nr < (ulonglong) sum_int) ||
				 (!unsigned_flag && nr < sum_int)))
    {
      sum_int=nr;
      null_value=0;
    }
  }
  break;
  case REAL_RESULT:
unknown's avatar
unknown committed
403 404
  {
    double nr=args[0]->val();
405
    if (!args[0]->null_value && (null_value || nr < sum))
unknown's avatar
unknown committed
406 407 408 409 410
    {
      sum=nr;
      null_value=0;
    }
  }
411 412 413 414 415 416 417 418 419 420
  break;
  }
  return 0;
}


bool Item_sum_max::add()
{
  switch (hybrid_type) {
  case STRING_RESULT:
unknown's avatar
unknown committed
421 422 423 424 425 426 427 428 429 430
  {
    String *result=args[0]->val_str(&tmp_value);
    if (!args[0]->null_value &&
	(null_value ||
	 (binary ? stringcmp(&value,result) : sortcmp(&value,result)) < 0))
    {
      value.copy(*result);
      null_value=0;
    }
  }
431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
  break;
  case INT_RESULT:
  {
    longlong nr=args[0]->val_int();
    if (!args[0]->null_value && (null_value ||
				 (unsigned_flag && 
				  (ulonglong) nr > (ulonglong) sum_int) ||
				 (!unsigned_flag && nr > sum_int)))
    {
      sum_int=nr;
      null_value=0;
    }
  }
  break;
  case REAL_RESULT:
  {
    double nr=args[0]->val();
    if (!args[0]->null_value && (null_value || nr > sum))
    {
      sum=nr;
      null_value=0;
    }
  }
  break;
  }
unknown's avatar
unknown committed
456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
  return 0;
}


/* bit_or and bit_and */

longlong Item_sum_bit::val_int()
{
  return (longlong) bits;
}

void Item_sum_bit::reset()
{
  bits=reset_bits; add();
}

bool Item_sum_or::add()
{
  ulonglong value= (ulonglong) args[0]->val_int();
  if (!args[0]->null_value)
    bits|=value;
  return 0;
}

bool Item_sum_and::add()
{
  ulonglong value= (ulonglong) args[0]->val_int();
  if (!args[0]->null_value)
    bits&=value;
  return 0;
}

/************************************************************************
** reset result of a Item_sum with is saved in a tmp_table
*************************************************************************/

void Item_sum_num::reset_field()
{
  double nr=args[0]->val();
  char *res=result_field->ptr;

  if (maybe_null)
  {
    if (args[0]->null_value)
    {
      nr=0.0;
      result_field->set_null();
    }
    else
      result_field->set_notnull();
  }
  float8store(res,nr);
}


void Item_sum_hybrid::reset_field()
{
  if (hybrid_type == STRING_RESULT)
  {
    char buff[MAX_FIELD_WIDTH];
    String tmp(buff,sizeof(buff)),*res;

    res=args[0]->val_str(&tmp);
    if (args[0]->null_value)
    {
      result_field->set_null();
      result_field->reset();
    }
    else
    {
      result_field->set_notnull();
      result_field->store(res->ptr(),res->length());
    }
  }
  else if (hybrid_type == INT_RESULT)
  {
    longlong nr=args[0]->val_int();

    if (maybe_null)
    {
      if (args[0]->null_value)
      {
	nr=0;
	result_field->set_null();
      }
      else
	result_field->set_notnull();
    }
    result_field->store(nr);
  }
  else						// REAL_RESULT
  {
    double nr=args[0]->val();

    if (maybe_null)
    {
      if (args[0]->null_value)
      {
	nr=0.0;
	result_field->set_null();
      }
      else
	result_field->set_notnull();
    }
    result_field->store(nr);
  }
}


void Item_sum_sum::reset_field()
{
  double nr=args[0]->val();			// Nulls also return 0
  float8store(result_field->ptr,nr);
  null_value=0;
  result_field->set_notnull();
}


void Item_sum_count::reset_field()
{
  char *res=result_field->ptr;
  longlong nr=0;

  if (!args[0]->maybe_null)
    nr=1;
  else
  {
    (void) args[0]->val_int();
    if (!args[0]->null_value)
      nr=1;
  }
  int8store(res,nr);
}


void Item_sum_avg::reset_field()
{
  double nr=args[0]->val();
  char *res=result_field->ptr;

  if (args[0]->null_value)
    bzero(res,sizeof(double)+sizeof(longlong));
  else
  {
    float8store(res,nr);
    res+=sizeof(double);
    longlong tmp=1;
    int8store(res,tmp);
  }
}

void Item_sum_bit::reset_field()
{
  char *res=result_field->ptr;
  ulonglong nr=(ulonglong) args[0]->val_int();
  int8store(res,nr);
}

/*
** calc next value and merge it with field_value
*/

void Item_sum_sum::update_field(int offset)
{
  double old_nr,nr;
  char *res=result_field->ptr;

  float8get(old_nr,res+offset);
  nr=args[0]->val();
  if (!args[0]->null_value)
    old_nr+=nr;
  float8store(res,old_nr);
}


void Item_sum_count::update_field(int offset)
{
  longlong nr;
  char *res=result_field->ptr;

  nr=sint8korr(res+offset);
  if (!args[0]->maybe_null)
    nr++;
  else
  {
    (void) args[0]->val_int();
    if (!args[0]->null_value)
      nr++;
  }
  int8store(res,nr);
}


void Item_sum_avg::update_field(int offset)
{
  double nr,old_nr;
  longlong field_count;
  char *res=result_field->ptr;

  float8get(old_nr,res+offset);
  field_count=sint8korr(res+offset+sizeof(double));

  nr=args[0]->val();
  if (!args[0]->null_value)
  {
    old_nr+=nr;
    field_count++;
  }
  float8store(res,old_nr);
  res+=sizeof(double);
  int8store(res,field_count);
}

void Item_sum_hybrid::update_field(int offset)
{
  if (hybrid_type == STRING_RESULT)
    min_max_update_str_field(offset);
  else if (hybrid_type == INT_RESULT)
    min_max_update_int_field(offset);
  else
    min_max_update_real_field(offset);
}


void
Item_sum_hybrid::min_max_update_str_field(int offset)
{
  String *res_str=args[0]->val_str(&value);

  if (args[0]->null_value)
    result_field->copy_from_tmp(offset);	// Use old value
  else
  {
    res_str->strip_sp();
    result_field->ptr+=offset;			// Get old max/min
    result_field->val_str(&tmp_value,&tmp_value);
    result_field->ptr-=offset;

    if (result_field->is_null() ||
	(cmp_sign * (binary ? stringcmp(res_str,&tmp_value) :
		 sortcmp(res_str,&tmp_value)) < 0))
      result_field->store(res_str->ptr(),res_str->length());
    else
    {						// Use old value
      char *res=result_field->ptr;
      memcpy(res,res+offset,result_field->pack_length());
    }
    result_field->set_notnull();
  }
}


void
Item_sum_hybrid::min_max_update_real_field(int offset)
{
  double nr,old_nr;

  result_field->ptr+=offset;
  old_nr=result_field->val_real();
  nr=args[0]->val();
  if (!args[0]->null_value)
  {
    if (result_field->is_null(offset) ||
	(cmp_sign > 0 ? old_nr > nr : old_nr < nr))
      old_nr=nr;
    result_field->set_notnull();
  }
  else if (result_field->is_null(offset))
    result_field->set_null();
  result_field->ptr-=offset;
  result_field->store(old_nr);
}


void
Item_sum_hybrid::min_max_update_int_field(int offset)
{
  longlong nr,old_nr;

  result_field->ptr+=offset;
  old_nr=result_field->val_int();
  nr=args[0]->val_int();
  if (!args[0]->null_value)
  {
740
    if (result_field->is_null(offset))
unknown's avatar
unknown committed
741
      old_nr=nr;
742 743 744 745 746 747
    else
    {
      bool res=(unsigned_flag ?
		(ulonglong) old_nr > (ulonglong) nr :
		old_nr > nr);
      /* (cmp_sign > 0 && res) || (!(cmp_sign > 0) && !res) */
unknown's avatar
unknown committed
748
      if ((cmp_sign > 0) ^ (!res))
749 750
	old_nr=nr;
    }
unknown's avatar
unknown committed
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
    result_field->set_notnull();
  }
  else if (result_field->is_null(offset))
    result_field->set_null();
  result_field->ptr-=offset;
  result_field->store(old_nr);
}


void Item_sum_or::update_field(int offset)
{
  ulonglong nr;
  char *res=result_field->ptr;

  nr=uint8korr(res+offset);
  nr|= (ulonglong) args[0]->val_int();
  int8store(res,nr);
}


void Item_sum_and::update_field(int offset)
{
  ulonglong nr;
  char *res=result_field->ptr;

  nr=uint8korr(res+offset);
  nr&= (ulonglong) args[0]->val_int();
  int8store(res,nr);
}


Item_avg_field::Item_avg_field(Item_sum_avg *item)
{
  name=item->name;
  decimals=item->decimals;
  max_length=item->max_length;
  field=item->result_field;
  maybe_null=1;
}

double Item_avg_field::val()
{
  double nr;
  longlong count;
  float8get(nr,field->ptr);
  char *res=(field->ptr+sizeof(double));
  count=sint8korr(res);

  if (!count)
  {
    null_value=1;
    return 0.0;
  }
  null_value=0;
  return nr/(double) count;
}

String *Item_avg_field::val_str(String *str)
{
  double nr=Item_avg_field::val();
  if (null_value)
    return 0;
  str->set(nr,decimals);
  return str;
}

Item_std_field::Item_std_field(Item_sum_std *item)
{
  name=item->name;
  decimals=item->decimals;
  max_length=item->max_length;
  field=item->result_field;
  maybe_null=1;
}

double Item_std_field::val()
{
  double sum,sum_sqr;
  longlong count;
  float8get(sum,field->ptr);
  float8get(sum_sqr,(field->ptr+sizeof(double)));
  count=sint8korr(field->ptr+sizeof(double)*2);

  if (!count)
  {
    null_value=1;
    return 0.0;
  }
  null_value=0;
  double tmp= (double) count;
  double tmp2=(sum_sqr - sum*sum/tmp)/tmp;
  return tmp2 <= 0.0 ? 0.0 : sqrt(tmp2);
}

String *Item_std_field::val_str(String *str)
{
  double nr=val();
  if (null_value)
    return 0;
  str->set(nr,decimals);
  return str;
}

/****************************************************************************
** COUNT(DISTINCT ...)
****************************************************************************/

#include "sql_select.h"

860 861
static int simple_raw_key_cmp(void* arg, byte* key1, byte* key2)
{
862
  return memcmp(key1, key2, *(uint*) arg);
863 864 865 866
}

static int simple_str_key_cmp(void* arg, byte* key1, byte* key2)
{
unknown's avatar
unknown committed
867
  return my_sortcmp((char*) key1, (char*) key2, *(uint*) arg);
868 869
}

unknown's avatar
unknown committed
870 871 872 873 874 875 876
/*
  Did not make this one static - at least gcc gets confused when
  I try to declare a static function as a friend. If you can figure
  out the syntax to make a static function a friend, make this one
  static
*/

877 878 879
int composite_key_cmp(void* arg, byte* key1, byte* key2)
{
  Item_sum_count_distinct* item = (Item_sum_count_distinct*)arg;
unknown's avatar
unknown committed
880 881 882 883 884 885 886 887 888 889 890 891 892
  Field **field    = item->table->field;
  Field **field_end= field + item->table->fields;
  uint32 *lengths=item->field_lengths;
  for (; field < field_end; ++field)
  {
    Field* f = *field;
    int len = *lengths++;
    int res = f->key_cmp(key1, key2);
    if (res)
      return res;
    key1 += len;
    key2 += len;
  }
893 894 895
  return 0;
}

unknown's avatar
unknown committed
896 897 898 899
/*
  helper function for walking the tree when we dump it to MyISAM -
  tree_walk will call it for each leaf
*/
900

901 902 903
int dump_leaf(byte* key, uint32 count __attribute__((unused)),
		     Item_sum_count_distinct* item)
{
unknown's avatar
unknown committed
904
  byte* buf = item->table->record[0];
905
  int error;
unknown's avatar
unknown committed
906 907 908 909
  /*
    The first item->rec_offset bytes are taken care of with
    restore_record(table,2) in setup()
  */
910 911 912
  memcpy(buf + item->rec_offset, key, item->tree.size_of_element);
  if ((error = item->table->file->write_row(buf)))
  {
unknown's avatar
unknown committed
913 914 915
    if (error != HA_ERR_FOUND_DUPP_KEY &&
	error != HA_ERR_FOUND_DUPP_UNIQUE)
      return 1;
916 917 918
  }
  return 0;
}
919

unknown's avatar
unknown committed
920

921
void Item_sum_count_distinct::no_rows_in_result()
unknown's avatar
unknown committed
922 923 924 925
{
  if (table)
    free_tmp_table(current_thd, table);
  delete tmp_table_param;
unknown's avatar
unknown committed
926
  if (use_tree)
927
    delete_tree(&tree);
unknown's avatar
unknown committed
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
}

bool Item_sum_count_distinct::fix_fields(THD *thd,TABLE_LIST *tables)
{
  if (Item_sum_num::fix_fields(thd,tables) ||
      !(tmp_table_param= new TMP_TABLE_PARAM))
    return 1;
  return 0;
}

bool Item_sum_count_distinct::setup(THD *thd)
{
  List<Item> list;
  /* Create a table with an unique key over all parameters */
  for (uint i=0; i < arg_count ; i++)
943 944 945 946 947 948 949 950 951 952 953 954 955
  {
    Item *item=args[i];
    if (list.push_back(item))
      return 1;					// End of memory
    if (item->const_item())
    {
      (void) item->val_int();
      if (item->null_value)
	always_null=1;
    }
  }
  if (always_null)
    return 0;
unknown's avatar
unknown committed
956
  count_field_types(tmp_table_param,list,0);
unknown's avatar
unknown committed
957 958 959 960 961 962
  if (table)
  {
    free_tmp_table(thd, table);
    tmp_table_param->cleanup();
  }
  if (!(table=create_tmp_table(thd, tmp_table_param, list, (ORDER*) 0, 1,
unknown's avatar
unknown committed
963 964
			       0, 0,
			       current_lex->select->options | thd->options)))
unknown's avatar
unknown committed
965 966
    return 1;
  table->file->extra(HA_EXTRA_NO_ROWS);		// Don't update rows
967
  table->no_rows=1;
968

unknown's avatar
unknown committed
969

unknown's avatar
unknown committed
970 971 972 973 974
  // no blobs, otherwise it would be MyISAM
  if (table->db_type == DB_TYPE_HEAP)
  {
    qsort_cmp2 compare_key;
    void* cmp_arg;
unknown's avatar
unknown committed
975

unknown's avatar
unknown committed
976 977
    // to make things easier for dump_leaf if we ever have to dump to MyISAM
    restore_record(table,2);
unknown's avatar
unknown committed
978

unknown's avatar
unknown committed
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
    if (table->fields == 1)
    {
      /*
	If we have only one field, which is the most common use of
	count(distinct), it is much faster to use a simpler key
	compare method that can take advantage of not having to worry
	about other fields
      */
      Field* field = table->field[0];
      switch(field->type())
      {
	/*
	  If we have a string, we must take care of charsets and case
	  sensitivity
	*/
      case FIELD_TYPE_STRING:
      case FIELD_TYPE_VAR_STRING:
	compare_key = (qsort_cmp2)(field->binary() ? simple_raw_key_cmp:
				   simple_str_key_cmp);
	break;
      default:
	/*
	  Since at this point we cannot have blobs anything else can
	  be compared with memcmp
	*/
	compare_key = (qsort_cmp2)simple_raw_key_cmp;
	break;
      }
1007 1008
      key_length = field->pack_length();
      cmp_arg = (void*) &key_length;
unknown's avatar
unknown committed
1009
      rec_offset = 1;
1010
    }
unknown's avatar
unknown committed
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
    else // too bad, cannot cheat - there is more than one field
    {
      bool all_binary = 1;
      Field** field, **field_end;
      field_end = (field = table->field) + table->fields;
      uint32 *lengths;
      if (!(field_lengths= 
	    (uint32*) thd->alloc(sizeof(uint32) * table->fields)))
	return 1;

1021
      for (key_length = 0, lengths=field_lengths; field < field_end; ++field)
unknown's avatar
unknown committed
1022 1023
      {
	uint32 length= (*field)->pack_length();
1024
	key_length += length;
unknown's avatar
unknown committed
1025 1026 1027 1028
	*lengths++ = length;
	if (!(*field)->binary())
	  all_binary = 0;			// Can't break loop here
      }
1029
      rec_offset = table->reclength - key_length;
unknown's avatar
unknown committed
1030 1031 1032
      if (all_binary)
      {
	compare_key = (qsort_cmp2)simple_raw_key_cmp;
1033
	cmp_arg = (void*) &key_length;
unknown's avatar
unknown committed
1034 1035 1036 1037
      }
      else
      {
	compare_key = (qsort_cmp2) composite_key_cmp ;
1038
	cmp_arg = (void*) this;
unknown's avatar
unknown committed
1039 1040 1041
      }
    }

1042 1043
    init_tree(&tree, min(thd->variables.max_heap_table_size,
			 thd->variables.sortbuff_size/16), 0,
1044
	      key_length, compare_key, 0, NULL, cmp_arg);
unknown's avatar
unknown committed
1045 1046 1047
    use_tree = 1;

    /*
1048
      The only time key_length could be 0 is if someone does
unknown's avatar
unknown committed
1049 1050 1051 1052
      count(distinct) on a char(0) field - stupid thing to do,
      but this has to be handled - otherwise someone can crash
      the server with a DoS attack
    */
1053 1054
    max_elements_in_tree = ((key_length) ? 
			    thd->variables.max_heap_table_size/key_length : 1);
unknown's avatar
unknown committed
1055
  }
unknown's avatar
unknown committed
1056 1057 1058
  return 0;
}

unknown's avatar
unknown committed
1059

1060 1061
int Item_sum_count_distinct::tree_to_myisam()
{
unknown's avatar
unknown committed
1062 1063 1064 1065
  if (create_myisam_from_heap(table, tmp_table_param,
			      HA_ERR_RECORD_FILE_FULL, 1) ||
      tree_walk(&tree, (tree_walk_action)&dump_leaf, (void*)this,
		left_root_right))
1066 1067 1068 1069 1070
    return 1;
  delete_tree(&tree);
  use_tree = 0;
  return 0;
}
unknown's avatar
unknown committed
1071 1072 1073

void Item_sum_count_distinct::reset()
{
unknown's avatar
merge  
unknown committed
1074
  if (use_tree)
1075
    reset_tree(&tree);
unknown's avatar
merge  
unknown committed
1076
  else if (table)
1077 1078 1079 1080 1081
  {
    table->file->extra(HA_EXTRA_NO_CACHE);
    table->file->delete_all_rows();
    table->file->extra(HA_EXTRA_WRITE_CACHE);
  }
unknown's avatar
unknown committed
1082 1083 1084 1085 1086 1087
  (void) add();
}

bool Item_sum_count_distinct::add()
{
  int error;
1088 1089
  if (always_null)
    return 0;
unknown's avatar
unknown committed
1090
  copy_fields(tmp_table_param);
unknown's avatar
unknown committed
1091
  copy_funcs(tmp_table_param->items_to_copy);
unknown's avatar
unknown committed
1092

1093 1094 1095 1096
  for (Field **field=table->field ; *field ; field++)
    if ((*field)->is_real_null(0))
      return 0;					// Don't count NULL

unknown's avatar
unknown committed
1097 1098 1099 1100 1101 1102 1103
  if (use_tree)
  {
    /*
      If the tree got too big, convert to MyISAM, otherwise insert into the
      tree.
    */
    if (tree.elements_in_tree > max_elements_in_tree)
1104
    {
1105
      if (tree_to_myisam())
1106 1107
	return 1;
    }
unknown's avatar
unknown committed
1108 1109 1110
    else if (!tree_insert(&tree, table->record[0] + rec_offset, 0))
      return 1;
  }
1111
  else if ((error=table->file->write_row(table->record[0])))
unknown's avatar
unknown committed
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
  {
    if (error != HA_ERR_FOUND_DUPP_KEY &&
	error != HA_ERR_FOUND_DUPP_UNIQUE)
    {
      if (create_myisam_from_heap(table, tmp_table_param, error,1))
	return 1;				// Not a table_is_full error
    }
  }
  return 0;
}

longlong Item_sum_count_distinct::val_int()
{
  if (!table)					// Empty query
    return LL(0);
unknown's avatar
unknown committed
1127
  if (use_tree)
1128
    return tree.elements_in_tree;
unknown's avatar
unknown committed
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
  table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
  return table->file->records;
}

/****************************************************************************
** Functions to handle dynamic loadable aggregates
** Original source by: Alexis Mikhailov <root@medinf.chuvashia.su>
** Adapted for UDAs by: Andreas F. Bobak <bobak@relog.ch>.
** Rewritten by: Monty.
****************************************************************************/

#ifdef HAVE_DLOPEN

void Item_udf_sum::reset()
{
  DBUG_ENTER("Item_udf_sum::reset");
  udf.reset(&null_value);
  DBUG_VOID_RETURN;
}

bool Item_udf_sum::add()
{
1151
  DBUG_ENTER("Item_udf_sum::add");
unknown's avatar
unknown committed
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
  udf.add(&null_value);
  DBUG_RETURN(0);
}

double Item_sum_udf_float::val()
{
  DBUG_ENTER("Item_sum_udf_float::val");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));
  DBUG_RETURN(udf.val(&null_value));
}

String *Item_sum_udf_float::val_str(String *str)
{
  double nr=val();
  if (null_value)
    return 0;					/* purecov: inspected */
  else
    str->set(nr,decimals);
  return str;
}


longlong Item_sum_udf_int::val_int()
{
  DBUG_ENTER("Item_sum_udf_int::val_int");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));
  DBUG_RETURN(udf.val_int(&null_value));
}

String *Item_sum_udf_int::val_str(String *str)
{
  longlong nr=val_int();
  if (null_value)
    return 0;
  else
    str->set(nr);
  return str;
}

/* Default max_length is max argument length */

void Item_sum_udf_str::fix_length_and_dec()
{
  DBUG_ENTER("Item_sum_udf_str::fix_length_and_dec");
  max_length=0;
  for (uint i = 0; i < arg_count; i++)
    set_if_bigger(max_length,args[i]->max_length);
  DBUG_VOID_RETURN;
}

String *Item_sum_udf_str::val_str(String *str)
{
  DBUG_ENTER("Item_sum_udf_str::str");
  String *res=udf.val_str(str,&str_value);
  null_value = !res;
  DBUG_RETURN(res);
}

#endif /* HAVE_DLOPEN */