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Fix for bug#4912 "mysqld crashs in case a statement is executed

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a second time". The bug was caused by incompatibility of
negations elimination algorithm and PS: during first statement 
execute a subtree with negation was replaced with equivalent 
subtree without NOTs.
The problem was that although this transformation was permanent, 
items of the new subtree were created in execute-local memory.
The patch adds means to check if it is the first execute of a
prepared statement, and if this is the case, to allocate items
in memory of the prepared statement.
The implementation:
- backports Item_arena from 5.0
- adds Item_arena::is_stmt_prepare(), 
  Item_arena::is_first_stmt_execute().
- deletes THD::allocate_temporary_pool_for_ps_preparing(),
  THD::free_temporary_pool_for_ps_preparing(); they
  were redundant.
and adds a few invariants:
- thd->free_list never contains junk (= freed items)
- thd->current_arena is never null. If there is no
  prepared statement, it points at the thd. 
The rest of the patch contains mainly mechanical changes and
cleanups.


mysql-test/r/ps.result:
  Test results updated (test case for Bug#4912)
mysql-test/t/ps.test:
  A test case for Bug#4912 "mysqld crashs in case a statement is 
  executed a second time"
sql/item_cmpfunc.cc:
  current_statement -> current_arena
sql/item_subselect.cc:
  Statement -> Item_arena, current_statement -> current_arena
sql/item_subselect.h:
  Item_subselect does not need to save thd->current_statement.
sql/item_sum.cc:
  Statement -> Item_arena
sql/item_sum.h:
  Statement -> Item_arena
sql/mysql_priv.h:
  Statement -> Item_arena
sql/sql_base.cc:
  current_statement -> current_arena
sql/sql_class.cc:
  - Item_arena
  - convenient set_n_backup_statement, restore_backup_statement
  (nice idea, Sanja)
sql/sql_class.h:
  - Item_arena: backport from 5.0
  - allocate_temporary_pool_for_ps_preparing,
    free_temporary_pool_for_ps_preparing removed.
sql/sql_derived.cc:
  current_statement -> current_arena
sql/sql_lex.cc:
  current_statement -> current_arena
sql/sql_parse.cc:
  Deploy invariant that thd->free_list never contains junk items
  (backport from 5.0).
sql/sql_prepare.cc:
  - backporting Item_arena
  - no need to allocate_temporary_pool_for_ps_preparing().
sql/sql_select.cc:
  Fix for bug#4912 "mysqld crashs in case a statement is 
  executed a second time": if this is the first execute of
  a prepared statement, negation elimination is
  done in memory of the prepared statement.
sql/sql_union.cc:
  Backporting Item_arena from 5.0.
This commit is contained in:
unknown
2004-08-21 02:02:46 +04:00
parent b368cb3f6e
commit 095b686c09
17 changed files with 316 additions and 260 deletions
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15
sql/sql_union.cc
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@@ -287,24 +287,23 @@ int st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
thd_arg->lex->current_select= lex_select_save;
if (!item_list.elements)
{
Statement *stmt= thd->current_statement;
Statement backup;
if (stmt)
thd->set_n_backup_item_arena(stmt, &backup);
Item_arena *arena= thd->current_arena, backup;
if (arena->is_stmt_prepare())
thd->set_n_backup_item_arena(arena, &backup);
Field **field;
for (field= table->field; *field; field++)
{
Item_field *item= new Item_field(*field);
if (!item || item_list.push_back(item))
{
if (stmt)
thd->restore_backup_item_arena(stmt, &backup);
if (arena->is_stmt_prepare())
thd->restore_backup_item_arena(arena, &backup);
DBUG_RETURN(-1);
}
}
if (stmt)
if (arena->is_stmt_prepare())
{
thd->restore_backup_item_arena(stmt, &backup);
thd->restore_backup_item_arena(arena, &backup);
/* prepare fake select to initialize it correctly */
ulong options_tmp= init_prepare_fake_select_lex(thd);