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handle them. Problem: CREATE|ALTER EVENT, HANDLER READ, KILL, Partitioning uses `expr` from the parser. This rule comes with all the rings and bells including subqueries. However, these commands are not subquery safe. For this reason there are two fuse checks in the parser. They were checking by command id. CREATE EVENT should forbid subquery is the fix for bug#16394 Events: Crash if schedule contains SELECT The fix has been incorporated as part of the patch for WL#3337 (Event scheduler new architecture). Solution: A new flag was added to LEX command_forbids_subselect. The fuse checks were changed. The commands are responsible to set the value to true whenever they can't handle subselects. sql/sql_lex.cc: initialize the variable sql/sql_lex.h: Add a new flag whether the parser should allow a subselect when parsing. This is temporarily turned off by commands like CREATE|ALTER EVENT, HA_READ, KILL. Could be used by other parts which reuse `expr` rule of the grammar and should not allow subqueries as part of it. sql/sql_yacc.yy: Forbid subselects in some commands in a better way. CREATE|ALTER EVENT, HANDLER READ, KILL, are not subselect safe for parameters and therefore they should be forbidden already in the parser. This patch makes it easier for the developer to add new commands in that sense similar to the mentioned above.
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