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6c06defb5f
heap_scan() makes info->next_block to be either an integer number of share->block.records_in_block's or the total number of records in the table. So when this total number or records changes, info->next_block needs to be recalculated to take it into account. This is a different fix for "Fixes a problem with heap when scanning and insert rows at the same time"
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* Copyright (c) 2000-2002, 2005-2007 MySQL AB
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Use is subject to license terms
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
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/* Scan through all rows */
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#include "heapdef.h"
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/*
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Returns one of following values:
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0 = Ok.
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HA_ERR_RECORD_DELETED = Record is deleted.
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HA_ERR_END_OF_FILE = EOF.
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*/
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int heap_scan_init(register HP_INFO *info)
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{
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DBUG_ENTER("heap_scan_init");
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info->lastinx= -1;
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info->current_record= (ulong) ~0L; /* No current record */
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info->update=0;
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info->next_block=0;
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info->key_version= info->s->key_version;
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info->file_version= info->s->file_version;
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DBUG_RETURN(0);
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}
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int heap_scan(register HP_INFO *info, uchar *record)
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{
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HP_SHARE *share=info->s;
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ulong pos;
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DBUG_ENTER("heap_scan");
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pos= ++info->current_record;
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if (pos < info->next_block)
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{
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info->current_ptr+=share->block.recbuffer;
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}
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else
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{
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/* increase next_block to the next records_in_block boundary */
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ulong rem= info->next_block % share->block.records_in_block;
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info->next_block+=share->block.records_in_block - rem;
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if (info->next_block >= share->records+share->deleted)
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{
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info->next_block= share->records+share->deleted;
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if (pos >= info->next_block)
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{
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info->update= 0;
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DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE);
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}
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}
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hp_find_record(info, pos);
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}
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if (!info->current_ptr[share->visible])
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{
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DBUG_PRINT("warning",("Found deleted record"));
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info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
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DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
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}
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info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV;
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memcpy(record,info->current_ptr,(size_t) share->reclength);
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info->current_hash_ptr=0; /* Can't use read_next */
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DBUG_RETURN(0);
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} /* heap_scan */
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