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A fix and test case for Bug#5985 ""prepare stmt from "select rand(?)"

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crashes server." The fix makes Item_func_rand prepared-statements
aware plus it fixes the case when RAND is used in prepared
statements and replication is on (as well as several similar issues).
Until now we did not reset THD before every execution of a prepared
statement, so if some execution had set thd->time_zone_used
or thd->rand_used they would not be reset until next mysql_parse.
Some of post-review fixes done.
This commit is contained in:
konstantin@mysql.com
2004-10-14 02:53:59 +04:00
parent cc57252bb7
commit 5abc3de22b
11 changed files with 159 additions and 54 deletions
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23
sql/sql_lex.cc
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@ -117,7 +117,30 @@ void lex_free(void)
void lex_start(THD *thd, uchar *buf,uint length)
{
LEX *lex= thd->lex;
lex->unit.init_query();
lex->unit.init_select();
lex->thd= thd;
lex->unit.thd= thd;
lex->select_lex.init_query();
lex->value_list.empty();
lex->param_list.empty();
lex->unit.next= lex->unit.master=
lex->unit.link_next= lex->unit.return_to= 0;
lex->unit.prev= lex->unit.link_prev= 0;
lex->unit.slave= lex->unit.global_parameters= lex->current_select=
lex->all_selects_list= &lex->select_lex;
lex->select_lex.master= &lex->unit;
lex->select_lex.prev= &lex->unit.slave;
lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
lex->select_lex.options= 0;
lex->describe= 0;
lex->derived_tables= FALSE;
lex->lock_option= TL_READ;
lex->found_colon= 0;
lex->safe_to_cache_query= 1;
lex->time_zone_tables_used= 0;
lex->select_lex.select_number= 1;
lex->next_state=MY_LEX_START;
lex->end_of_query=(lex->ptr=buf)+length;
lex->yylineno = 1;