Disable ALTER for oqgraph. Fixes crash caused by 1134355.

mysql-test/suite/oqgraph/regression_1134355.result

+DROP TABLE IF EXISTS graph_base;
+DROP TABLE IF EXISTS graph;
+CREATE TABLE graph_base (
+from_id INT UNSIGNED NOT NULL,
+to_id INT UNSIGNED NOT NULL,
+another_id INT UNSIGNED NOT NULL DEFAULT 1,
+w DOUBLE NOT NULL DEFAULT 1,
+PRIMARY KEY (from_id,to_id),
+INDEX (to_id)
+) ENGINE=MyISAM;
+CREATE TABLE graph (
+latch   VARCHAR(32) NULL,
+origid  BIGINT    UNSIGNED NULL,
+destid  BIGINT    UNSIGNED NULL,
+weight  DOUBLE    NULL,
+seq     BIGINT    UNSIGNED NULL,
+linkid  BIGINT    UNSIGNED NULL,
+KEY (latch, origid, destid) USING HASH,
+KEY (latch, destid, origid) USING HASH
+) ENGINE=OQGRAPH DATA_TABLE='graph_base' ORIGID='from_id', DESTID='to_id', WEIGHT='w';
+INSERT INTO graph_base(from_id, to_id) VALUES (1,2), (2,1);
+INSERT INTO graph_base(from_id, to_id) VALUES (1,3), (3,1);
+INSERT INTO graph_base(from_id, to_id) VALUES (1,4), (4,1);
+INSERT INTO graph_base(from_id, to_id) VALUES (3,4), (4,3);
+SELECT * from graph;
+latch	origid	destid	weight	seq	linkid
+NULL	1	2	1	NULL	NULL
+NULL	2	1	1	NULL	NULL
+NULL	1	3	1	NULL	NULL
+NULL	3	1	1	NULL	NULL
+NULL	1	4	1	NULL	NULL
+NULL	4	1	1	NULL	NULL
+NULL	3	4	1	NULL	NULL
+NULL	4	3	1	NULL	NULL
+SELECT * FROM graph WHERE destid=2 and origid=1;
+latch	origid	destid	weight	seq	linkid
+NULL	1	2	1	NULL	NULL
+alter table graph ORIGID = 'another_id';
+ERROR HY000: Table storage engine for 'graph' doesn't have this option
+alter table graph ORIGID = 'something_else';
+ERROR HY000: Table storage engine for 'graph' doesn't have this option
+DELETE FROM graph_base;
+FLUSH TABLES;
+TRUNCATE TABLE graph_base;
+DROP TABLE graph_base;
+DROP TABLE graph;

mysql-test/suite/oqgraph/regression_1134355.test

@@ -9,6 +9,8 @@ DROP TABLE IF EXISTS graph;
 CREATE TABLE graph_base (
     from_id INT UNSIGNED NOT NULL,
     to_id INT UNSIGNED NOT NULL,
+    another_id INT UNSIGNED NOT NULL DEFAULT 1,
+    w DOUBLE NOT NULL DEFAULT 1,
     PRIMARY KEY (from_id,to_id),
     INDEX (to_id)
   ) ENGINE=MyISAM;
@@ -23,7 +25,7 @@ CREATE TABLE graph (
     linkid  BIGINT    UNSIGNED NULL,
     KEY (latch, origid, destid) USING HASH,
     KEY (latch, destid, origid) USING HASH
-  ) ENGINE=OQGRAPH DATA_TABLE='graph_base' ORIGID='from_id', DESTID='to_id';
+  ) ENGINE=OQGRAPH DATA_TABLE='graph_base' ORIGID='from_id', DESTID='to_id', WEIGHT='w';
 
 # -- do some stuff
 
@@ -35,8 +37,18 @@ INSERT INTO graph_base(from_id, to_id) VALUES (3,4), (4,3);
 SELECT * from graph;
 SELECT * FROM graph WHERE destid=2 and origid=1;
 
-# -- trigger bug
-# --error 1296  # commented out at the moment because the message is corrupted
+# We cant do this anyway because of read onlyness of table.... 1036 == read only
+# In any case I changed the flags to make alter unsupported; later we can try and work out why the core doesnt help us clean up properly
+# --error 1036
+--error 1031
+alter table graph ORIGID = 'another_id';
+
+# But we need that to hold even in an invalid situation!
+# -- bug was: the following alter table would crash, instead of returning error 1296
+# -- currently following may not crash, but does with the previous error 1036 causing statement present
+#  'attribute not set to a valid column of 'xxx'  - note currently truncating to graph_b instead of graph_base for some reason...
+#--error 1296
+--error 1031
 alter table graph ORIGID = 'something_else';
 
 DELETE FROM graph_base;

storage/oqgraph/ha_oqgraph.cc

@@ -109,11 +109,11 @@ static const char *latchToCode(int latch) {
 
 struct oqgraph_table_option_struct
 {
-  char *table_name;
+  const char *table_name;
 
-  char *origid; // name of the origin id column
-  char *destid; // name of the target id column
-  char *weight; // name of the weight column (optional)
+  const char *origid; // name of the origin id column
+  const char *destid; // name of the target id column
+  const char *weight; // name of the weight column (optional)
 };
 
 #define ha_table_option_struct oqgraph_table_option_struct
@@ -193,7 +193,12 @@ static bool oqgraph_init()
   hton->state= SHOW_OPTION_YES;
   hton->db_type= DB_TYPE_AUTOASSIGN;
   hton->create= oqgraph_create_handler;
-  hton->flags= HTON_NO_FLAGS;
+  hton->flags= HTON_ALTER_NOT_SUPPORTED;
+  // Prevent ALTER, because the core crashes when the user provides a
+  // non-existing backing store field for ORIGID, etc
+  // 'Fixes' bug 1134355  
+  // HTON_NO_FLAGS;
+  
   hton->table_options= oqgraph_table_option_list;
   oqgraph_init_done= TRUE;
   return 0;