Test to check illegal ops return correct error code

mysql-test/suite/oqgraph/invalid_operations.test

+--disable_warnings
+DROP TABLE IF EXISTS graph_base;
+DROP TABLE IF EXISTS graph;
+--enable_warnings
+
+# Create the backing store
+CREATE TABLE graph_base (
+    from_id INT UNSIGNED NOT NULL,
+    to_id INT UNSIGNED NOT NULL,
+    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';
+
+
+INSERT INTO graph_base(from_id, to_id) VALUES (1,2), (2,1);
+INSERT INTO graph_base(from_id, to_id) VALUES (3,2), (2,3);
+INSERT INTO graph_base(from_id, to_id) VALUES (1,3), (3,1);
+
+# -- check readonly'ness
+--error 1036
+insert into graph values (NULL, 1, 2, 3.0, NULL, NULL);
+
+--error 1036
+delete from graph;
+
+--error 1036
+truncate graph;
+
+# This was hitting bug https://bugs.launchpad.net/oqgraph/+bug/1233113
+--error 1036
+update graph set origid=123;
+
+
+DROP TABLE graph_base;
+DROP TABLE graph;
+