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Code Activity

Implemented MDEV-3941: CREATE TABLE xxx IF NOT EXISTS should not block if table exists.

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- Added option to check_if_table_exists() to quickly check if table exists (either SHARE or .FRM)
- Extended lock_table_names() to not wait for meta data locks if CREATE IF NOT EXISTS is used.

mysql-test/r/create.result:
  New test case
mysql-test/t/create.test:
  New test case
sql/sql_base.cc:
  Added option to check_if_table_exists() to quickly check if table exists (either SHARE or .FRM)
  Extended lock_table_names() to not wait for meta data locks if CREATE IF NOT EXISTS is used.
sql/sql_base.h:
  Updated prototype
sql/sql_db.cc:
  Added extra argument to call to check_if_table_exists()
This commit is contained in:
Michael Widenius
2012-12-16 16:13:17 +02:00
parent a6a8f12fa3
commit 33f3a11e2d
5 changed files with 111 additions and 14 deletions
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3
sql/sql_base.h
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@ -302,7 +302,8 @@ TABLE *find_table_for_mdl_upgrade(THD *thd, const char *db,
const char *table_name,
bool no_error);
void mark_tmp_table_for_reuse(TABLE *table);
bool check_if_table_exists(THD *thd, TABLE_LIST *table, bool *exists);
bool check_if_table_exists(THD *thd, TABLE_LIST *table, bool fast_check,
bool *exists);
int update_virtual_fields(THD *thd, TABLE *table,
enum enum_vcol_update_mode vcol_update_mode= VCOL_UPDATE_FOR_READ);
int dynamic_column_error_message(enum_dyncol_func_result rc);