into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt50-merge

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-30237

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-23062

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-30237

This is a performance bug, related to the parsing or 'OR' and 'AND' boolean
expressions.

Let N be the number of expressions involved in a OR (respectively AND).

When N=1

For example, "select 1" involve only 1 term: there is no OR operator.

In 4.0 and 4.1, parsing expressions not involving OR had no overhead.
In 5.0, parsing adds some overhead, with Select->expr_list.

With this patch, the overhead introduced in 5.0 has been removed,
so that performances for N=1 should be identical to the 4.0 performances,
which are optimal (there is no code executed at all)

The overhead in 5.0 was in fact affecting significantly some operations.
For example, loading 1 Million rows into a table with INSERTs,
for a table that has 100 columns, leads to parsing 100 Millions of
expressions, which means that the overhead related to Select->expr_list
is executed 100 Million times ...

Considering that N=1 is by far the most probable expression,
this case should be optimal.

When N=2

For example, "select a OR b" involves 2 terms in the OR operator.

In 4.0 and 4.1, parsing expressions involving 2 terms created 1 Item_cond_or
node, which is the expected result.
In 5.0, parsing these expression also produced 1 node, but with some extra
overhead related to Select->expr_list : creating 1 list in Select->expr_list
and another in Item_cond::list is inefficient.

With this patch, the overhead introduced in 5.0 has been removed
so that performances for N=2 should be identical to the 4.0 performances.
Note that the memory allocation uses the new (thd->mem_root) syntax
directly.
The cost of "is_cond_or" is estimated to be neglectable: the real problem
of the performance degradation comes from unneeded memory allocations.

When N>=3

For example, "select a OR b OR c ...", which involves 3 or more terms.

In 4.0 and 4.1, the parser had no significant cost overhead, but produced
an Item tree which is difficult to evaluate / optimize during runtime.
In 5.0, the parser produces a better Item tree, using the Item_cond
constructor that accepts a list of children directly, but at an extra cost
related to Select->expr_list.

With this patch, the code is implemented to take the best of the two
implementations:
- there is no overhead with Select->expr_list
- the Item tree generated is optimized and flattened.

This is achieved by adding children nodes into the Item tree directly,
with Item_cond::add(), which avoids the need for temporary lists and memory
allocation

Note that this patch also provide an extra optimization, that the previous
code in 5.0 did not provide: expressions are flattened in the Item tree,
based on what the expression already parsed is, and not based on the order
in which rules are reduced.

For example : "(a OR b) OR c", "a OR (b OR c)" would both be represented
with 2 Item_cond_or nodes before this patch, and with 1 node only with this
patch. The logic used is based on the mathematical properties of the OR
operator (it's associative), and produces a simpler tree.

into  adventure.(none):/home/thek/Development/cpp/mysql-5.0-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  adventure.(none):/home/thek/Development/cpp/bug30269/my51-bug30269

Although the query cache doesn't support retrieval of statements containing
column level access control, it was still possible to cache such statements
thus wasting memory.
  
This patch extends the access control check on the target tables to avoid
caching a statement with column level restrictions. 

Views are excepted and can be cached but only retrieved by super user account.

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt50-merge

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt-merge

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-rt-merge

Finish premature patch which was accidentally pushed; remove debugging
info and correct the test.

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/50

When using --log --log-output=table, we increment Table_locks_immediate
with every query.  The wait_condition.inc runs a query a variable number
of times, depending on server load, etc.  This is a problem, when the
test is checking the Table_locks_immediate value.

Fix is to adjust the Table_locks_immediate value based on how many times
the wait_condition query was executed.

into  moksha.local:/Users/davi/mysql/push/mysql-5.1-runtime

This is a follow up for the patch for Bug#26162 "Trigger DML ignores low_priority_updates setting", where the stored procedure ignores the session setting of low_priority_updates.

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.0-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  adventure.(none):/home/thek/Development/cpp/bug30269/my51-bug30269

Although the query cache doesn't support retrieval of statements containing
column level access control, it was still possible to cache such statements
thus wasting memory.

This patch extends the access control check on the target tables to avoid
caching a statement with column level restrictions. 

mysql_ha_open calls mysql_ha_close on the error path (unsupported) to close the (opened) table before inserting it into the tables hash list handler_tables_hash) but mysql_ha_close only closes tables which are on the hash list, causing the table to be left open and locked.

This change moves the table close logic into a separate function that is always called on the error path of mysql_ha_open or on a normal handler close (mysql_ha_close).

into  kindahl-laptop.dnsalias.net:/home/bk/fix-mysql-5.1-rpl

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

This is a follow up for the patch for Bug#26162 "Trigger DML ignores low_priority_updates setting", where the stored procedure ignores the session setting of low_priority_updates.

For every table open operation with default write (TL_WRITE_DEFAULT) lock_type, downgrade the lock type to the session setting of low_priority_updates.

Revert the fix for bug 21587.  That bug will be re-opened, and a new
fix must be created.