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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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2
sql/sql_handler.cc
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@ -187,7 +187,7 @@ bool mysql_ha_open(THD *thd, TABLE_LIST *tables, bool reopen)
/* for now HANDLER can be used only for real TABLES */
tables->required_type= FRMTYPE_TABLE;
error= open_tables(thd, tables, &counter);
error= open_tables(thd, &tables, &counter);
HANDLER_TABLES_HACK(thd);
if (error)