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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef DRIZZLED_JOIN_CACHE_H
#define DRIZZLED_JOIN_CACHE_H
namespace drizzled
{
class Field_blob;
typedef JoinTable JoinTable;
/**
CacheField and JoinCache is used on full join to cache records in outer
table
*/
class CacheField {
/*
Where source data is located (i.e. this points to somewhere in
tableX->getInsertRecord())
*/
public:
unsigned char *str;
uint32_t length; /* Length of data at *str, in bytes */
uint32_t blob_length; /* Valid IFF blob_field != 0 */
Field_blob *blob_field;
bool strip; /* true <=> Strip endspaces ?? */
Table *get_rowid; /* _ != NULL <=> */
CacheField():
str(NULL),
length(0),
blob_length(0),
blob_field(NULL),
strip(false),
get_rowid(NULL)
{}
};
class JoinCache
{
public:
unsigned char *buff;
unsigned char *pos; /* Start of free space in the buffer */
unsigned char *end;
uint32_t records; /* # of row cominations currently stored in the cache */
uint32_t record_nr;
uint32_t ptr_record;
/*
Number of fields (i.e. cache_field objects). Those correspond to table
columns, and there are also special fields for
- table's column null bits
- table's null-complementation byte
- [new] table's rowid.
*/
uint32_t fields;
uint32_t length;
uint32_t blobs;
CacheField *field;
CacheField **blob_ptr;
optimizer::SqlSelect *select;
JoinCache():
buff(NULL),
pos(NULL),
end(NULL),
records(0),
record_nr(0),
ptr_record(0),
fields(0),
length(0),
blobs(0),
field(NULL),
blob_ptr(NULL),
select(NULL)
{}
void reset_cache_read();
void reset_cache_write();
bool store_record_in_cache();
};
int join_init_cache(Session *session, JoinTable *tables, uint32_t table_count);
} /* namespace drizzled */
#endif /* DRIZZLED_JOIN_CACHE_H */
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