set tidb_cost_model_version=1;
#
# Bug#30311271 RAND() < RAND() RESULTS IN IMPOSSIBLE WHERE
#
# See that the optimizer does not consider two instances of RAND() as
# equal.
EXPLAIN SELECT 1 WHERE RAND() < RAND();
id	estRows	task	access object	operator info
Projection_4	0.80	root		1->Column#1
└─Selection_5	0.80	root		lt(rand(), rand())
  └─TableDual_6	1.00	root		rows:1