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Merge with MariaDB 5.1

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This commit is contained in:
Michael Widenius
2011-11-24 18:48:58 +02:00
parent e3e60a4102 d26aefb077
commit 6920457142
1136 changed files with 25385 additions and 15098 deletions
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40
sql/sql_cache.cc
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@ -1,4 +1,5 @@
/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
/*
Copyright (c) 2000, 2010, Oracle and/or its affiliates.
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
@ -11,7 +12,8 @@
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 */
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
Description of the query cache:
@ -1258,8 +1260,8 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
/* Key is query + database + flag */
if (thd->db_length)
{
memcpy(thd->query() + thd->query_length() + 1, thd->db,
thd->db_length);
memcpy(thd->query() + thd->query_length() + 1 + sizeof(size_t),
thd->db, thd->db_length);
DBUG_PRINT("qcache", ("database: %s length: %u",
thd->db, (unsigned) thd->db_length));
}
@ -1268,7 +1270,7 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
DBUG_PRINT("qcache", ("No active database"));
}
tot_length= thd->query_length() + thd->db_length + 1 +
QUERY_CACHE_FLAGS_SIZE;
sizeof(size_t) + QUERY_CACHE_FLAGS_SIZE;
/*
We should only copy structure (don't use it location directly)
because of alignment issue
@ -1482,7 +1484,29 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
goto err;
}
}
{
/*
We have allocated buffer space (in alloc_query) to hold the
SQL statement(s) + the current database name + a flags struct.
If the database name has changed during execution, which might
happen if there are multiple statements, we need to make
sure the new current database has a name with the same length
as the previous one.
*/
size_t db_len;
memcpy((char *) &db_len, (sql + query_length + 1), sizeof(size_t));
if (thd->db_length != db_len)
{
/*
We should probably reallocate the buffer in this case,
but for now we just leave it uncached
*/
DBUG_PRINT("qcache",
("Current database has changed since start of query"));
goto err;
}
}
/*
Try to obtain an exclusive lock on the query cache. If the cache is
disabled or if a full cache flush is in progress, the attempt to
@ -1504,10 +1528,12 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
Query_cache_block *query_block;
tot_length= query_length + thd->db_length + 1 + QUERY_CACHE_FLAGS_SIZE;
tot_length= query_length + 1 + sizeof(size_t) +
thd->db_length + QUERY_CACHE_FLAGS_SIZE;
if (thd->db_length)
{
memcpy(sql+query_length+1, thd->db, thd->db_length);
memcpy(sql + query_length + 1 + sizeof(size_t), thd->db, thd->db_length);
DBUG_PRINT("qcache", ("database: '%s' length: %u",
thd->db, (unsigned)thd->db_length));
}