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Fix rare infinite loop in make_join_statistics(). Thanks to

Browse source 
Paul Cadach <paul@odt.east.telecom.kz> for the code.

See Message-ID: <000a01c0a022$c0b910a0$b78313d4@private3se6v3w>
on internals@lists.mysql.com.
This commit is contained in:
tim@threads.polyesthetic.msg 2001-03-04 15:09:15 -05:00
parent fd45aed782
commit 4842d3da6b
1 changed files with 4 additions and 1 deletions
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5
sql/sql_select.cc
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@ -945,8 +945,10 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
DBUG_RETURN(1);
/* loop until no more const tables are found */
int ref_changed;
do
{
ref_changed = 0;
found_ref=0;
for (JOIN_TAB **pos=stat_vector+const_count; (s= *pos) ; pos++)
{
@ -996,6 +998,7 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
s->type=JT_CONST;
const_table_map|=table->map;
set_position(join,const_count++,s,start_keyuse);
ref_changed = 1;
break;
}
else
@ -1004,7 +1007,7 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
}
}
}
} while (const_table_map & found_ref);
} while (const_table_map & found_ref && ref_changed);
/* Calc how many (possible) matched records in each table */