Manual merge from mysql-5.1-bugteam to mysql-trunk-merge.

conflicts:
   conflict      configure.in

configure.in

@@ -844,8 +844,8 @@ AC_TYPE_SIZE_T
 AC_HEADER_DIRENT
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
-AC_CHECK_HEADERS(fcntl.h fenv.h float.h floatingpoint.h ieeefp.h limits.h \
- memory.h pwd.h select.h poll.h \
+AC_CHECK_HEADERS(fcntl.h fenv.h float.h floatingpoint.h fpu_control.h \
+ ieeefp.h limits.h memory.h pwd.h select.h poll.h \
  stdlib.h stddef.h \
  strings.h string.h synch.h sys/mman.h sys/socket.h netinet/in.h arpa/inet.h \
  sys/timeb.h sys/types.h sys/un.h sys/vadvise.h sys/wait.h term.h \

mysql-test/r/explain.result

@@ -258,4 +258,17 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 DROP TABLE t1, t2;
+#
+# Bug #48573: difference of index selection between rpm binary and
+#             .tar.gz, windows vs linux..
+#
+CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5));
+INSERT INTO t1 VALUES(4, 1, 1, 1);
+INSERT INTO t1 VALUES(3, 1, 1, 1);
+INSERT INTO t1 VALUES(2, 1, 1, 1);
+INSERT INTO t1 VALUES(1, 1, 1, 1);
+EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	c2,c2_2	c2	10	const,const	3	Using where
+DROP TABLE t1;
 End of 5.1 tests.

mysql-test/t/explain.test

@@ -223,4 +223,19 @@ EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND
 
 DROP TABLE t1, t2;
 
+--echo #
+--echo # Bug #48573: difference of index selection between rpm binary and
+--echo #             .tar.gz, windows vs linux..
+--echo #
+
+CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5));
+INSERT INTO t1 VALUES(4, 1, 1, 1);
+INSERT INTO t1 VALUES(3, 1, 1, 1);
+INSERT INTO t1 VALUES(2, 1, 1, 1);
+INSERT INTO t1 VALUES(1, 1, 1, 1);
+
+EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests.