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MDEV-8010 - Avoid sql_alloc() in Items (Patch #1)

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Added mandatory thd parameter to Item (and all derivative classes) constructor.
Added thd parameter to all routines that may create items.
Also removed "current_thd" from Item::Item. This reduced number of
pthread_getspecific() calls from 290 to 177 per OLTP RO transaction.
This commit is contained in:
Sergey Vojtovich
2015-08-11 11:18:38 +04:00
parent 4374da63f0
commit 31e365efae
71 changed files with 2724 additions and 2474 deletions
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8
sql/sql_table.cc
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@@ -3268,7 +3268,7 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
pointer in the parsed tree of a prepared statement or a
stored procedure statement.
*/
sql_field->def= sql_field->def->safe_charset_converter(save_cs);
sql_field->def= sql_field->def->safe_charset_converter(thd, save_cs);
if (sql_field->def == NULL)
{
@@ -7414,7 +7414,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
This field was not dropped and not changed, add it to the list
for the new table.
*/
def= new Create_field(field, field);
def= new Create_field(thd, field, field);
new_create_list.push_back(def);
alter_it.rewind(); // Change default if ALTER
Alter_column *alter;
@@ -9626,9 +9626,9 @@ bool mysql_checksum_table(THD *thd, TABLE_LIST *tables,
*/
DBUG_ASSERT(! thd->in_sub_stmt);
field_list.push_back(item = new Item_empty_string("Table", NAME_LEN*2));
field_list.push_back(item = new Item_empty_string(thd, "Table", NAME_LEN*2));
item->maybe_null= 1;
field_list.push_back(item= new Item_int("Checksum",
field_list.push_back(item= new Item_int(thd, "Checksum",
(longlong) 1,
MY_INT64_NUM_DECIMAL_DIGITS));
item->maybe_null= 1;