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Better approach for prelocking of tables for stored routines execution

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and some SP-related cleanups.

- We don't have separate stage for calculation of list of tables
  to be prelocked and doing implicit LOCK/UNLOCK any more.
  Instead we calculate this list at open_tables() and do implicit
  LOCK in lock_tables() (and UNLOCK in close_thread_tables()).
  Also now we support cases when same table (with same alias) is
  used several times in the same query in SP.

- Cleaned up execution of SP. Moved all common code which handles
  LEX and does preparations before statement execution or complex
  expression evaluation to auxilary sp_lex_keeper class. Now 
  all statements in SP (and corresponding instructions) that
  evaluate expression which can contain subquery have their
  own LEX.
This commit is contained in:
dlenev@brandersnatch.localdomain
2005-03-04 16:35:28 +03:00
parent 6611d3d2f8
commit 5a6c7027f0
29 changed files with 1804 additions and 877 deletions
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sql/mysql_priv.h
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@ -845,7 +845,7 @@ int setup_conds(THD *thd, TABLE_LIST *tables, TABLE_LIST *leaves,
int setup_ftfuncs(SELECT_LEX* select);
int init_ftfuncs(THD *thd, SELECT_LEX* select, bool no_order);
void wait_for_refresh(THD *thd);
int open_tables(THD *thd, TABLE_LIST *tables, uint *counter);
int open_tables(THD *thd, TABLE_LIST **tables, uint *counter);
int simple_open_n_lock_tables(THD *thd,TABLE_LIST *tables);
bool open_and_lock_tables(THD *thd,TABLE_LIST *tables);
bool open_normal_and_derived_tables(THD *thd, TABLE_LIST *tables);