From a68fb2d8219f6bccc573009600e9f23e89226a5e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 20:04:16 +0200 Subject: Adding upstream version 1:10.6.11. Signed-off-by: Daniel Baumann --- storage/heap/hp_rfirst.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 storage/heap/hp_rfirst.c (limited to 'storage/heap/hp_rfirst.c') diff --git a/storage/heap/hp_rfirst.c b/storage/heap/hp_rfirst.c new file mode 100644 index 00000000..60596a2c --- /dev/null +++ b/storage/heap/hp_rfirst.c @@ -0,0 +1,68 @@ +/* Copyright (c) 2000-2002, 2004-2007 MySQL AB + Use is subject to license terms + + 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; version 2 of the License. + + 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +#include "heapdef.h" + +/* Read first record with the current key */ + +int heap_rfirst(HP_INFO *info, uchar *record, int inx) +{ + HP_SHARE *share = info->s; + HP_KEYDEF *keyinfo = share->keydef + inx; + + DBUG_ENTER("heap_rfirst"); + info->lastinx= inx; + info->key_version= info->s->key_version; + + if (keyinfo->algorithm == HA_KEY_ALG_BTREE) + { + uchar *pos; + + if ((pos = tree_search_edge(&keyinfo->rb_tree, info->parents, + &info->last_pos, offsetof(TREE_ELEMENT, left)))) + { + memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos), + sizeof(uchar*)); + info->current_ptr = pos; + memcpy(record, pos, (size_t)share->reclength); + /* + If we're performing index_first on a table that was taken from + table cache, info->lastkey_len is initialized to previous query. + Thus we set info->lastkey_len to proper value for subsequent + heap_rnext() calls. + This is needed for DELETE queries only, otherwise this variable is + not used. + Note that the same workaround may be needed for heap_rlast(), but + for now heap_rlast() is never used for DELETE queries. + */ + info->lastkey_len= 0; + info->update = HA_STATE_AKTIV; + } + else + { + info->update= HA_STATE_NO_KEY; + my_errno = HA_ERR_END_OF_FILE; + DBUG_RETURN(my_errno); + } + DBUG_RETURN(0); + } + else + { + /* We can't scan a non existing key value with hash index */ + my_errno= HA_ERR_WRONG_COMMAND; + DBUG_RETURN(my_errno); + } +} -- cgit v1.2.3