diff options
Diffstat (limited to 'myisam/rt_index.c')
| -rw-r--r-- | myisam/rt_index.c | 914 |
1 files changed, 914 insertions, 0 deletions
diff --git a/myisam/rt_index.c b/myisam/rt_index.c new file mode 100644 index 00000000000..d55d01fa4a3 --- /dev/null +++ b/myisam/rt_index.c @@ -0,0 +1,914 @@ +/* Copyright (C) 2000 MySQL AB & Ramil Kalimullin & MySQL Finland AB + & TCX DataKonsult AB + + 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. + + 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. + + 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 */ + +#include "myisamdef.h" + +#include "rt_index.h" +#include "rt_key.h" +#include "rt_mbr.h" + +#define REINSERT_BUFFER_INC 10 + +typedef struct st_page_level +{ + uint level; + my_off_t offs; +} stPageLevel; + +typedef struct st_page_list +{ + ulong n_pages; + ulong m_pages; + stPageLevel *pages; +} stPageList; + +/* +Find next key in r-tree according to search_flag recursively +Used in rtree_find_first() and rtree_find_next() +Result values: +-1 - error + 0 - found + 1 - not found +*/ +static int rtree_find_req(MI_INFO *info, MI_KEYDEF *keyinfo, uint search_flag, uint nod_cmp_flag, + my_off_t page, int level) +{ + uchar *k; + uchar *last; + uint nod_flag; + int res; + uchar *page_buf; + int k_len; + int *saved_key = (int*)(info->rtree_recursion_state + level * sizeof(int)); + + if (!(page_buf = (uchar*)my_alloca((uint)keyinfo->block_length))) + { + my_errno = HA_ERR_OUT_OF_MEM; + return -1; + } + if (!_mi_fetch_keypage(info, keyinfo, page, page_buf, 0)) + goto err1; + nod_flag = mi_test_if_nod(page_buf); + + k_len = keyinfo->keylength - info->s->base.rec_reflength; + + if(info->rtree_recursion_depth >= level) + { + k = page_buf + *saved_key; + if (!nod_flag) + { + /* Only leaf pages contain data references. */ + /* Need to check next key with data reference. */ + k = rt_PAGE_NEXT_KEY(k, k_len, nod_flag); + } + } + else + { + k = rt_PAGE_FIRST_KEY(page_buf, nod_flag); + } + last = rt_PAGE_END(page_buf); + + for (; k < last; k = rt_PAGE_NEXT_KEY(k, k_len, nod_flag)) + { + if (nod_flag) + { + /* this is an internal node in the tree */ + if (!(res = rtree_key_cmp(keyinfo->seg, info->lastkey2, k, + info->last_rkey_length, nod_cmp_flag))) + { + switch ((res = rtree_find_req(info, keyinfo, search_flag, nod_cmp_flag, + _mi_kpos(nod_flag, k), level + 1))) + { + case 0: /* found - exit from recursion */ + *saved_key = k - page_buf; + goto ok; + case 1: /* not found - continue searching */ + info->rtree_recursion_depth = level; + break; + default: /* error */ + case -1: + goto err1; + } + } + } + else + { + /* this is a leaf */ + if (!rtree_key_cmp(keyinfo->seg, info->lastkey2, k, + info->last_rkey_length, search_flag)) + { + uchar *after_key = rt_PAGE_NEXT_KEY(k, k_len, nod_flag); + info->lastpos = _mi_dpos(info, 0, after_key); + info->lastkey_length = k_len + info->s->base.rec_reflength; + memcpy(info->lastkey, k, k_len + info->s->base.rec_reflength); + + info->rtree_recursion_depth = level; + *saved_key = k - page_buf; + + if (after_key < last) + { + info->int_keypos = (uchar*)saved_key; + memcpy(info->buff, page_buf, keyinfo->block_length); + info->int_maxpos = rt_PAGE_END(info->buff); + info->buff_used = 0; + } + + res = 0; + goto ok; + } + } + } + info->lastpos = HA_OFFSET_ERROR; + my_errno = HA_ERR_KEY_NOT_FOUND; + res = 1; + +ok: + my_afree((byte*)page_buf); + return res; + +err1: + my_afree((byte*)page_buf); + info->lastpos = HA_OFFSET_ERROR; + return -1; +} + +/* +Find first key in r-tree according to search_flag condition +Result values: +-1 - error + 0 - found + 1 - not found +*/ +int rtree_find_first(MI_INFO *info, uint keynr, uchar *key, uint key_length, + uint search_flag) +{ + my_off_t root; + uint nod_cmp_flag; + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + + if ((root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + return -1; + + /* Save searched key */ + memcpy(info->lastkey2, key, keyinfo->keylength - info->s->base.rec_reflength); + info->last_rkey_length = key_length; + + info->rtree_recursion_depth = -1; + info->buff_used = 1; + + nod_cmp_flag = ((search_flag & (MBR_EQUAL | MBR_WITHIN)) ? + MBR_WITHIN : MBR_INTERSECT); + return rtree_find_req(info, keyinfo, search_flag, nod_cmp_flag, root, 0); +} + +/* +Find next key in r-tree according to search_flag condition +Result values: +-1 - error + 0 - found + 1 - not found +*/ +int rtree_find_next(MI_INFO *info, uint keynr, uint search_flag) +{ + my_off_t root; + uint nod_cmp_flag; + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + + if (!info->buff_used) + { + uint k_len = keyinfo->keylength - info->s->base.rec_reflength; + /* rt_PAGE_NEXT_KEY(info->int_keypos) */ + uchar *key = info->buff + *(int*)info->int_keypos + k_len + + info->s->base.rec_reflength; + + while (key < info->int_maxpos) + { + if (!rtree_key_cmp(keyinfo->seg, info->lastkey2, key, + info->last_rkey_length, search_flag)) + { + /* rt_PAGE_NEXT_KEY(key) */ + uchar *after_key = key + k_len + info->s->base.rec_reflength; + + info->lastpos = _mi_dpos(info, 0, after_key); + info->lastkey_length = k_len + info->s->base.rec_reflength; + memcpy(info->lastkey, key, k_len + info->s->base.rec_reflength); + + *(int*)info->int_keypos = key - info->buff; + if (after_key >= info->int_maxpos) + { + info->buff_used = 1; + } + + return 0; + } + else + { + key += k_len + info->s->base.rec_reflength; + } + } + } + if ((root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + return -1; + + nod_cmp_flag = ((search_flag & (MBR_EQUAL | MBR_WITHIN)) ? + MBR_WITHIN : MBR_INTERSECT); + return rtree_find_req(info, keyinfo, search_flag, nod_cmp_flag, root, 0); +} + +/* +Get next key in r-tree recursively +Used in rtree_get_first() and rtree_get_next() +Result values: +-1 - error + 0 - found + 1 - not found +*/ +static int rtree_get_req(MI_INFO *info, MI_KEYDEF *keyinfo, uint key_length, + my_off_t page, int level) +{ + uchar *k; + uchar *last; + uint nod_flag; + int res; + uchar *page_buf; + uint k_len; + int *saved_key = (int*)(info->rtree_recursion_state + level*sizeof(int)); + + if (!(page_buf = (uchar*)my_alloca((uint)keyinfo->block_length))) + return -1; + if (!_mi_fetch_keypage(info, keyinfo, page, page_buf, 0)) + goto err1; + nod_flag = mi_test_if_nod(page_buf); + + k_len = keyinfo->keylength - info->s->base.rec_reflength; + + if(info->rtree_recursion_depth >= level) + { + k = page_buf + *saved_key; + if (!nod_flag) + { + /* Only leaf pages contain data references. */ + /* Need to check next key with data reference. */ + k = rt_PAGE_NEXT_KEY(k, k_len, nod_flag); + } + } + else + { + k = rt_PAGE_FIRST_KEY(page_buf, nod_flag); + } + last = rt_PAGE_END(page_buf); + + for (; k < last; k = rt_PAGE_NEXT_KEY(k, k_len, nod_flag)) + { + if (nod_flag) + { + /* this is an internal node in the tree */ + switch ((res = rtree_get_req(info, keyinfo, key_length, + _mi_kpos(nod_flag, k), level + 1))) + { + case 0: /* found - exit from recursion */ + *saved_key = k - page_buf; + goto ok; + case 1: /* not found - continue searching */ + info->rtree_recursion_depth = level; + break; + default: + case -1: /* error */ + goto err1; + } + } + else + { + /* this is a leaf */ + uchar *after_key = rt_PAGE_NEXT_KEY(k, k_len, nod_flag); + info->lastpos = _mi_dpos(info, 0, after_key); + info->lastkey_length = k_len + info->s->base.rec_reflength; + memcpy(info->lastkey, k, k_len + info->s->base.rec_reflength); + + info->rtree_recursion_depth = level; + *saved_key = k - page_buf; + + if (after_key < last) + { + info->int_keypos = (uchar*)saved_key; + memcpy(info->buff, page_buf, keyinfo->block_length); + info->int_maxpos = rt_PAGE_END(info->buff); + info->buff_used = 0; + } + + res = 0; + goto ok; + } + } + info->lastpos = HA_OFFSET_ERROR; + my_errno = HA_ERR_KEY_NOT_FOUND; + res = 1; + +ok: + my_afree((byte*)page_buf); + return res; + +err1: + my_afree((byte*)page_buf); + info->lastpos = HA_OFFSET_ERROR; + return -1; +} + +/* +Get first key in r-tree +Result values: +-1 - error + 0 - found + 1 - not found +*/ +int rtree_get_first(MI_INFO *info, uint keynr, uint key_length) +{ + my_off_t root; + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + + if ((root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + return -1; + + info->rtree_recursion_depth = -1; + info->buff_used = 1; + + return rtree_get_req(info, &keyinfo[keynr], key_length, root, 0); +} + +/* Get next key in r-tree +Result values: +-1 - error + 0 - found + 1 - not found +*/ +int rtree_get_next(MI_INFO *info, uint keynr, uint key_length) +{ + my_off_t root; + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + + if (!info->buff_used) + { + uint k_len = keyinfo->keylength - info->s->base.rec_reflength; + /* rt_PAGE_NEXT_KEY(info->int_keypos) */ + uchar *key = info->buff + *(int*)info->int_keypos + k_len + + info->s->base.rec_reflength; + /* rt_PAGE_NEXT_KEY(key) */ + uchar *after_key = key + k_len + info->s->base.rec_reflength; + + info->lastpos = _mi_dpos(info, 0, after_key); + info->lastkey_length = k_len + info->s->base.rec_reflength; + memcpy(info->lastkey, key, k_len + info->s->base.rec_reflength); + + *(int*)info->int_keypos = key - info->buff; + if (after_key >= info->int_maxpos) + { + info->buff_used = 1; + } + + return 0; + } + else + { + if ((root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + return -1; + + return rtree_get_req(info, &keyinfo[keynr], key_length, root, 0); + } +} + +/* +Go down and insert key into tree +Result values: +-1 - error + 0 - child was not split + 1 - child was split +*/ +static int rtree_insert_req(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key, + uint key_length, my_off_t page, my_off_t *new_page, + int ins_level, int level) +{ + uchar *k; + uint nod_flag; + uchar *page_buf; + int res; + + if (!(page_buf = (uchar*)my_alloca((uint)keyinfo->block_length + + MI_MAX_KEY_BUFF))) + { + my_errno = HA_ERR_OUT_OF_MEM; + return -1; + } + if (!_mi_fetch_keypage(info, keyinfo, page, page_buf, 0)) + goto err1; + nod_flag = mi_test_if_nod(page_buf); + + if ((ins_level == -1 && nod_flag) || /* key: go down to leaf */ + (ins_level > -1 && ins_level > level)) /* branch: go down to ins_level */ + { + if ((k = rtree_choose_key(info, keyinfo, key, key_length, page_buf, + nod_flag)) == NULL) + goto err1; + switch ((res = rtree_insert_req(info, keyinfo, key, key_length, + _mi_kpos(nod_flag, k), new_page, ins_level, level + 1))) + { + case 0: /* child was not split */ + { + rtree_combine_rect(keyinfo->seg, k, key, k, key_length); + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + goto ok; + } + case 1: /* child was split */ + { + uchar *new_key = page_buf + keyinfo->block_length + nod_flag; + /* set proper MBR for key */ + if (rtree_set_key_mbr(info, keyinfo, k, key_length, + _mi_kpos(nod_flag, k))) + goto err1; + /* add new key for new page */ + _mi_kpointer(info, new_key - nod_flag, *new_page); + if (rtree_set_key_mbr(info, keyinfo, new_key, key_length, *new_page)) + goto err1; + res = rtree_add_key(info, keyinfo, new_key, key_length, + page_buf, new_page); + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + goto ok; + } + default: + case -1: /* error */ + { + goto err1; + } + } + } + else + { + res = rtree_add_key(info, keyinfo, key, key_length, page_buf, new_page); + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + goto ok; + } + +ok: + my_afree((byte*)page_buf); + return res; + +err1: + my_afree((byte*)page_buf); + return -1; +} + +/* +Insert key into the tree +Result values: +-1 - error + 0 - root was not split + 1 - root was split +*/ +static int rtree_insert_level(MI_INFO *info, uint keynr, uchar *key, + uint key_length, int ins_level) +{ + my_off_t old_root; + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + int res; + my_off_t new_page; + + if ((old_root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + { + int res; + + if ((old_root = _mi_new(info, keyinfo)) == HA_OFFSET_ERROR) + return -1; + info->buff_used = 1; + mi_putint(info->buff, 2, 0); + res = rtree_add_key(info, keyinfo, key, key_length, info->buff, NULL); + if (_mi_write_keypage(info, keyinfo, old_root, info->buff)) + return 1; + info->s->state.key_root[keynr] = old_root; + return res; + } + + switch ((res = rtree_insert_req(info, &keyinfo[keynr], key, key_length, + old_root, &new_page, ins_level, 0))) + { + case 0: /* root was not split */ + { + break; + } + case 1: /* root was split, grow a new root */ + { + uchar *new_root_buf; + my_off_t new_root; + uchar *new_key; + uint nod_flag = info->s->base.key_reflength; + + if (!(new_root_buf = (uchar*)my_alloca((uint)keyinfo->block_length + + MI_MAX_KEY_BUFF))) + { + my_errno = HA_ERR_OUT_OF_MEM; + return -1; + } + + mi_putint(new_root_buf, 2, nod_flag); + if ((new_root = _mi_new(info, keyinfo)) == HA_OFFSET_ERROR) + goto err1; + + new_key = new_root_buf + keyinfo->block_length + nod_flag; + + _mi_kpointer(info, new_key - nod_flag, old_root); + if (rtree_set_key_mbr(info, keyinfo, new_key, key_length, old_root)) + goto err1; + if (rtree_add_key(info, keyinfo, new_key, key_length, new_root_buf, NULL) + == -1) + goto err1; + _mi_kpointer(info, new_key - nod_flag, new_page); + if (rtree_set_key_mbr(info, keyinfo, new_key, key_length, new_page)) + goto err1; + if (rtree_add_key(info, keyinfo, new_key, key_length, new_root_buf, NULL) + == -1) + goto err1; + if (_mi_write_keypage(info, keyinfo, new_root, new_root_buf)) + goto err1; + info->s->state.key_root[keynr] = new_root; + + my_afree((byte*)new_root_buf); + break; +err1: + my_afree((byte*)new_root_buf); + return -1; + } + default: + case -1: /* error */ + { + break; + } + } + return res; +} + +/* +Insert key into the tree - interface function +Result values: +-1 - error + 0 - OK +*/ +int rtree_insert(MI_INFO *info, uint keynr, uchar *key, uint key_length) +{ + return (rtree_insert_level(info, keynr, key, key_length, -1) == -1) ? -1 : 0; +} + +/* +Fill reinsert page buffer +*/ +static int rtree_fill_reinsert_list(stPageList *ReinsertList, my_off_t page, + int level) +{ + if (ReinsertList->n_pages == ReinsertList->m_pages) + { + ReinsertList->m_pages += REINSERT_BUFFER_INC; + if (!(ReinsertList->pages = (stPageLevel*)my_realloc((gptr)ReinsertList->pages, + ReinsertList->m_pages * sizeof(stPageLevel), MYF(MY_ALLOW_ZERO_PTR)))) + goto err1; + } + /* save page to ReinsertList */ + ReinsertList->pages[ReinsertList->n_pages].offs = page; + ReinsertList->pages[ReinsertList->n_pages].level = level; + ReinsertList->n_pages++; + return 0; + +err1: + return -1; +} + +/* +Go down and delete key from the tree +Result values: +-1 - error + 0 - deleted + 1 - not found + 2 - empty leaf +*/ +static int rtree_delete_req(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key, + uint key_length, my_off_t page, uint *page_size, + stPageList *ReinsertList, int level) +{ + uchar *k; + uchar *last; + ulong i; + uint nod_flag; + uchar *page_buf; + int res; + + if (!(page_buf = (uchar*)my_alloca((uint)keyinfo->block_length))) + { + my_errno = HA_ERR_OUT_OF_MEM; + return -1; + } + if (!_mi_fetch_keypage(info, keyinfo, page, page_buf, 0)) + goto err1; + nod_flag = mi_test_if_nod(page_buf); + + k = rt_PAGE_FIRST_KEY(page_buf, nod_flag); + last = rt_PAGE_END(page_buf); + + for (i = 0; k < last; k = rt_PAGE_NEXT_KEY(k, key_length, nod_flag), ++i) + { + if (nod_flag) + { + /* not leaf */ + if (!rtree_key_cmp(keyinfo->seg, key, k, key_length, MBR_WITHIN)) + { + switch ((res = rtree_delete_req(info, keyinfo, key, key_length, + _mi_kpos(nod_flag, k), page_size, ReinsertList, level + 1))) + { + case 0: /* deleted */ + { + /* test page filling */ + if (*page_size + key_length >= rt_PAGE_MIN_SIZE(keyinfo->block_length)) + { + /* OK */ + if (rtree_set_key_mbr(info, keyinfo, k, key_length, + _mi_kpos(nod_flag, k))) + goto err1; + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + } + else + { + /* too small: delete key & add it descendant to reinsert list */ + if (rtree_fill_reinsert_list(ReinsertList, _mi_kpos(nod_flag, k), + level + 1)) + goto err1; + rtree_delete_key(info, page_buf, k, key_length, nod_flag); + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + *page_size = mi_getint(page_buf); + } + + goto ok; + } + case 1: /* not found - continue searching */ + { + break; + } + case 2: /* vacuous case: last key in the leaf */ + { + rtree_delete_key(info, page_buf, k, key_length, nod_flag); + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + *page_size = mi_getint(page_buf); + res = 0; + goto ok; + } + default: /* error */ + case -1: + { + goto err1; + } + } + } + } + else + { + /* leaf */ + if (!rtree_key_cmp(keyinfo->seg, key, k, key_length, MBR_EQUAL | MBR_DATA)) + { + rtree_delete_key(info, page_buf, k, key_length, nod_flag); + *page_size = mi_getint(page_buf); + if (*page_size == 2) + { + /* last key in the leaf */ + res = 2; + if (_mi_dispose(info, keyinfo, page)) + goto err1; + } + else + { + res = 0; + if (_mi_write_keypage(info, keyinfo, page, page_buf)) + goto err1; + } + goto ok; + } + } + } + res = 1; + +ok: + my_afree((byte*)page_buf); + return res; + +err1: + my_afree((byte*)page_buf); + return -1; +} + +/* +Delete key - interface function +Result values: +-1 - error + 0 - deleted +*/ +int rtree_delete(MI_INFO *info, uint keynr, uchar *key, uint key_length) +{ + uint page_size; + stPageList ReinsertList; + my_off_t old_root; + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + + if ((old_root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + { + my_errno = HA_ERR_KEY_NOT_FOUND; + return -1; + } + + ReinsertList.pages = NULL; + ReinsertList.n_pages = 0; + ReinsertList.m_pages = 0; + + switch (rtree_delete_req(info, keyinfo, key, key_length, old_root, + &page_size, &ReinsertList, 0)) + { + case 2: + { + info->s->state.key_root[keynr] = HA_OFFSET_ERROR; + return 0; + } + case 0: + { + uint nod_flag; + ulong i; + for (i = 0; i < ReinsertList.n_pages; ++i) + { + uchar *page_buf; + uint nod_flag; + uchar *k; + uchar *last; + + if (!(page_buf = (uchar*)my_alloca((uint)keyinfo->block_length))) + { + my_errno = HA_ERR_OUT_OF_MEM; + goto err1; + } + if (!_mi_fetch_keypage(info, keyinfo, ReinsertList.pages[i].offs, + page_buf, 0)) + goto err1; + nod_flag = mi_test_if_nod(page_buf); + k = rt_PAGE_FIRST_KEY(page_buf, nod_flag); + last = rt_PAGE_END(page_buf); + for (; k < last; k = rt_PAGE_NEXT_KEY(k, key_length, nod_flag)) + { + if (rtree_insert_level(info, keynr, k, key_length, + ReinsertList.pages[i].level) == -1) + { + my_afree((byte*)page_buf); + goto err1; + } + } + my_afree((byte*)page_buf); + if (_mi_dispose(info, keyinfo, ReinsertList.pages[i].offs)) + goto err1; + } + if (ReinsertList.pages) + free(ReinsertList.pages); + + /* check for redundant root (not leaf, 1 child) and eliminate */ + if ((old_root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + goto err1; + if (!_mi_fetch_keypage(info, keyinfo, old_root, info->buff, 0)) + goto err1; + nod_flag = mi_test_if_nod(info->buff); + page_size = mi_getint(info->buff); + if (nod_flag && (page_size == 2 + key_length + + (nod_flag ? nod_flag : info->s->base.rec_reflength))) + { + my_off_t new_root = _mi_kpos(nod_flag, + rt_PAGE_FIRST_KEY(info->buff, nod_flag)); + if (_mi_dispose(info, keyinfo, old_root)) + goto err1; + info->s->state.key_root[keynr] = new_root; + } + return 0; + +err1: + return -1; + } + case 1: /* not found */ + { + my_errno = HA_ERR_KEY_NOT_FOUND; + return -1; + } + default: + case -1: /* error */ + { + return -1; + } + } +} + +/* +Estimate number of suitable keys in the tree +*/ +ha_rows rtree_estimate(MI_INFO *info, uint keynr, uchar *key, + uint key_length, uint flag) +{ + MI_KEYDEF *keyinfo = info->s->keyinfo + keynr; + my_off_t root; + uint i = 0; + uchar *k; + uchar *last; + uint nod_flag; + uchar *page_buf; + uint k_len; + double area = 0; + ha_rows res = 0; + + if (flag & MBR_DISJOINT) + return info->state->records; + + if ((root = info->s->state.key_root[keynr]) == HA_OFFSET_ERROR) + return HA_POS_ERROR; + if (!(page_buf = (uchar*)my_alloca((uint)keyinfo->block_length))) + return HA_POS_ERROR; + if (!_mi_fetch_keypage(info, keyinfo, root, page_buf, 0)) + goto err1; + nod_flag = mi_test_if_nod(page_buf); + + k_len = keyinfo->keylength - info->s->base.rec_reflength; + + k = rt_PAGE_FIRST_KEY(page_buf, nod_flag); + last = rt_PAGE_END(page_buf); + + for (; k < last; k = rt_PAGE_NEXT_KEY(k, k_len, nod_flag), ++i) + { + if (nod_flag) + { + double k_area = rtree_rect_volume(keyinfo->seg, k, key_length); + + if (k_area == 0) + { + if (flag & (MBR_CONTAIN | MBR_INTERSECT)) + { + area += 1; + } + else if (flag & (MBR_WITHIN | MBR_EQUAL)) + { + if (!rtree_key_cmp(keyinfo->seg, key, k, key_length, MBR_WITHIN)) + area += 1; + } + else + goto err1; + } + else + { + if (flag & (MBR_CONTAIN | MBR_INTERSECT)) + { + area += rtree_overlapping_area(keyinfo->seg, key, k, key_length) / + k_area; + } + else if (flag & (MBR_WITHIN | MBR_EQUAL)) + { + if (!rtree_key_cmp(keyinfo->seg, key, k, key_length, MBR_WITHIN)) + area += rtree_rect_volume(keyinfo->seg, key, key_length) / + k_area; + } + else + goto err1; + } + } + else + { + if (!rtree_key_cmp(keyinfo->seg, key, k, key_length, flag)) + ++res; + } + } + if (nod_flag) + { + if (i) + res = (int)(area / i * info->state->records); + else + res = HA_POS_ERROR; + } + + my_afree((byte*)page_buf); + return res; + +err1: + my_afree((byte*)page_buf); + return HA_POS_ERROR; +} |