Merge bk@192.168.21.1:mysql-5.1-opt

into  mysql.com:/home/hf/work/32942/my51-32942


sql/sql_select.cc:
  Auto merged
mysql-test/r/select.result:
  merging
mysql-test/t/select.test:
  merging

mysql-test/r/select.result

@@ -4319,6 +4319,27 @@ SELECT * FROM t1 WHERE a IN (CONCAT('foo', 0), 'bar');
 a
 foo0
 DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT);
+CREATE TABLE t2 (a INT, c INT, KEY(a));
+INSERT INTO t1 VALUES (1, 1), (2, 2);
+INSERT INTO t2 VALUES (1, 1), (1, 2), (1, 3), (1, 4), (1, 5),
+(2, 1), (2, 2), (2, 3), (2, 4), (2, 5),
+(3, 1), (3, 2), (3, 3), (3, 4), (3, 5),
+(4, 1), (4, 2), (4, 3), (4, 4), (4, 5);
+FLUSH STATUS;
+SELECT DISTINCT b FROM t1 LEFT JOIN t2 USING(a) WHERE c <= 3;
+b
+1
+2
+SHOW STATUS LIKE 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	2
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	6
+DROP TABLE t1, t2;
 End of 5.0 tests
 create table t1(a INT, KEY (a));
 INSERT INTO t1 VALUES (1),(2),(3),(4),(5);

mysql-test/t/select.test

@@ -3672,6 +3672,24 @@ INSERT INTO t1 (a) VALUES ('foo0'), ('bar0'), ('baz0');
 SELECT * FROM t1 WHERE a IN (CONCAT('foo', 0), 'bar');
 DROP TABLE t1;
 
+#
+# Bug #32942 now() - interval '7200' second is NOT pre-calculated, causing "full table scan"
+#
+
+CREATE TABLE t1 (a INT, b INT);
+CREATE TABLE t2 (a INT, c INT, KEY(a));
+
+INSERT INTO t1 VALUES (1, 1), (2, 2);
+INSERT INTO t2 VALUES (1, 1), (1, 2), (1, 3), (1, 4), (1, 5),
+                      (2, 1), (2, 2), (2, 3), (2, 4), (2, 5),
+                      (3, 1), (3, 2), (3, 3), (3, 4), (3, 5),
+                      (4, 1), (4, 2), (4, 3), (4, 4), (4, 5);
+
+FLUSH STATUS;
+SELECT DISTINCT b FROM t1 LEFT JOIN t2 USING(a) WHERE c <= 3;
+SHOW STATUS LIKE 'Handler_read%';
+DROP TABLE t1, t2;
+
 --echo End of 5.0 tests
 
 #

sql/sql_select.cc

@@ -11178,7 +11178,7 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
         we found a row, as no new rows can be added to the result.
       */
       if (not_used_in_distinct && found_records != join->found_records)
-        return NESTED_LOOP_OK;
+        return NESTED_LOOP_NO_MORE_ROWS;
     }
     else
       join_tab->read_record.file->unlock_row();