Added some changes inspired by Zardosht Kasheff:

- Added a handler call (prepare_index_scan()) to inform storage engines that an index scan is about to take place.
- Extended the maximun key parts for an index from 16 to 32
- Extended MyISAM and Maria engines to support up to 32 parts

Added checks for return value from ha_index_init()



include/my_handler.h:
  Extended number of key parts for MyISAM and Maria from 16 to 32
include/my_pthread.h:
  Ensure we always have 256M of stack.
  (Required to be able to handle the current number of keys and key parts in MyISAM)
mysql-test/r/create.result:
  Extended to test for 32 key parts
mysql-test/r/myisam.result:
  Test that we can create 32 but not 33 key parts
mysql-test/r/ps_1general.result:
  Length of ref is now 2048 as we can have more key parts
mysql-test/r/ps_2myisam.result:
  Length of ref is now 2048 as we can have more key parts
mysql-test/r/ps_3innodb.result:
  Length of ref is now 2048 as we can have more key parts
mysql-test/r/ps_4heap.result:
  Length of ref is now 2048 as we can have more key parts
mysql-test/r/ps_5merge.result:
  Length of ref is now 2048 as we can have more key parts
mysql-test/suite/maria/r/maria.result:
  Max key length is now 1208 bytes
mysql-test/suite/maria/r/maria3.result:
  Max key length is now 1208 bytes
mysql-test/suite/maria/r/ps_maria.result:
  Max key length is now 1208 byte
mysql-test/t/create.test:
  Extended to test for 32 key parts
mysql-test/t/myisam.test:
  Test that we can create 32 but not 33 key parts
sql/handler.cc:
  Check return value from ha_index_init()
sql/handler.h:
  Added a handler call (prepare_index_scan()) to inform storage engines that an index scan is about to take place.
sql/sql_select.cc:
  Checks all return values from ha_index_init()
  Call prepare_index_scan()) to inform storage engines that an index scan is about to take place.
  Fixed indentation
sql/table.cc:
  Fixed wrong types for key_length (rest of code assumed this was 32 bit)
sql/unireg.h:
  Extended the maximun key parts for an index from 16 to 32
storage/maria/ha_maria.cc:
  Don't allocate HA_CHECK on the stack in functions where we call repair() as HA_CHECK is HUGE and will overflow stack
storage/myisam/ha_myisam.cc:
  Don't allocate HA_CHECK on the stack in functions where we call repair() as HA_CHECK is HUGE and will overflow stack
storage/myisam/mi_check.c:
  Fixed wrong check if value overflow
tests/mysql_client_test.c:
  Added fflush() to fix output in case of error
  Fixed wrong check of 'ref' length in EXPLAIN

1 files changed, 20 insertions, 4 deletions

diff --git a/mysql-test/r/create.result b/mysql-test/r/create.result
index bd1d9e825cc..97f4f5669d1 100644
--- a/mysql-test/r/create.result
+++ b/mysql-test/r/create.result
@@ -1487,10 +1487,10 @@ ERROR 42000: Too many keys specified; max 64 keys allowed
 drop table t1;
 create table t1 (c1 int, c2 int, c3 int, c4 int, c5 int, c6 int, c7 int, 
 c8 int, c9 int, c10 int, c11 int, c12 int, c13 int, c14 int, c15 int, 
-c16 int, c17 int);
+c16 int, c17 int, c18 int,c19 int,c20 int,c21 int,c22 int,c23 int,c24 int,c25 int,c26 int,c27 int,c28 int,c29 int,c30 int,c31 int,c32 int, c33 int);
 alter table t1 add key i1 (
-c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16, c17);
-ERROR 42000: Too many key parts specified; max 16 parts allowed
+c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16, c17,c18,c19,c20,c21,c22,c23,c24,c25,c26,c27,c28,c29,c30,c31,c32,c33);
+ERROR 42000: Too many key parts specified; max 32 parts allowed
 alter table t1 add key 
 a001_long_123456789_123456789_123456789_123456789_123456789_12345 (c1);
 ERROR 42000: Identifier name 'a001_long_123456789_123456789_123456789_123456789_123456789_12345' is too long
@@ -1513,7 +1513,23 @@ t1	CREATE TABLE `t1` (
   `c14` int(11) DEFAULT NULL,
   `c15` int(11) DEFAULT NULL,
   `c16` int(11) DEFAULT NULL,
-  `c17` int(11) DEFAULT NULL
+  `c17` int(11) DEFAULT NULL,
+  `c18` int(11) DEFAULT NULL,
+  `c19` int(11) DEFAULT NULL,
+  `c20` int(11) DEFAULT NULL,
+  `c21` int(11) DEFAULT NULL,
+  `c22` int(11) DEFAULT NULL,
+  `c23` int(11) DEFAULT NULL,
+  `c24` int(11) DEFAULT NULL,
+  `c25` int(11) DEFAULT NULL,
+  `c26` int(11) DEFAULT NULL,
+  `c27` int(11) DEFAULT NULL,
+  `c28` int(11) DEFAULT NULL,
+  `c29` int(11) DEFAULT NULL,
+  `c30` int(11) DEFAULT NULL,
+  `c31` int(11) DEFAULT NULL,
+  `c32` int(11) DEFAULT NULL,
+  `c33` int(11) DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;