Commit b12b64a0 authored by unknown's avatar unknown

added comment

parent 32208e02
......@@ -2257,6 +2257,10 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
{
JOIN_TAB *tab=join->join_tab+i;
table_map current_map= tab->table->map;
/*
Following force including random expression in last table condition.
It solve problem with select like SELECT * FROM t1 WHERE rand() > 0.5
*/
if (i == join->tables-1)
current_map|= RAND_TABLE_BIT;
bool use_quick_range=0;
......
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