Fixed bug #53334.

The fix actually reverts the change introduced by the patch
for bug 51494
The fact is that the patch for bug 52177 fixes bug 51194 as well.

mysql-test/r/innodb_mysql.result

@@ -2350,4 +2350,34 @@ Null
 Index_type	BTREE
 Comment	
 DROP TABLE t1;
+#
+# Bug #53334: wrong result for outer join with impossible ON condition
+# (see the same test case for MyISAM in join.test)
+#
+create table t1 (id int primary key);
+create table t2 (id int);
+insert into t1 values (75);
+insert into t1 values (79);
+insert into t1 values (78);
+insert into t1 values (77);
+replace into t1 values (76);
+replace into t1 values (76);
+insert into t1 values (104);
+insert into t1 values (103);
+insert into t1 values (102);
+insert into t1 values (101);
+insert into t1 values (105);
+insert into t1 values (106);
+insert into t1 values (107);
+insert into t2 values (107),(75),(1000);
+select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0
+where t2.id=75 and t1.id is null;
+id	id
+NULL	75
+explain select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0
+where t2.id=75 and t1.id is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	NULL	NULL	NULL	1	Impossible ON condition
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+drop table t1,t2;
 End of 5.1 tests

mysql-test/t/innodb_mysql.test

@@ -591,4 +591,35 @@ ALTER TABLE t1 DROP INDEX k, ADD UNIQUE INDEX k (a,b);
 
 DROP TABLE t1;
 
+--echo #
+--echo # Bug #53334: wrong result for outer join with impossible ON condition
+--echo # (see the same test case for MyISAM in join.test)
+--echo #
+
+create table t1 (id int primary key);
+create table t2 (id int);
+
+insert into t1 values (75);
+insert into t1 values (79);
+insert into t1 values (78);
+insert into t1 values (77);
+replace into t1 values (76);
+replace into t1 values (76);
+insert into t1 values (104);
+insert into t1 values (103);
+insert into t1 values (102);
+insert into t1 values (101);
+insert into t1 values (105);
+insert into t1 values (106);
+insert into t1 values (107);
+
+insert into t2 values (107),(75),(1000);
+
+select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0
+  where t2.id=75 and t1.id is null;
+explain select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0
+  where t2.id=75 and t1.id is null;
+
+drop table t1,t2;
+
 --echo End of 5.1 tests

sql/sql_select.cc

@@ -3008,8 +3008,7 @@ make_join_statistics(JOIN *join, TABLE_LIST *tables_arg, COND *conds,
       s->quick=select->quick;
       s->needed_reg=select->needed_reg;
       select->quick=0;
-      if (records == 0 && s->table->reginfo.impossible_range &&
-          (s->table->file->ha_table_flags() & HA_STATS_RECORDS_IS_EXACT))
+      if (records == 0 && s->table->reginfo.impossible_range)
       {
 	/*
 	  Impossible WHERE or ON expression