Bug #17766: The server accepts to create MERGE tables which cannot work

 Changed the error reporting (and a crash) when inserting data into a
 MERGE table that has no underlying tables or no INSERT_METHOD specified
 by reporting that it is read-only.


include/my_base.h:
  Add new handler error
mysql-test/r/merge.result:
  Update results
mysql-test/t/merge.test:
  Add new regression test
sql/ha_myisammrg.cc:
  When trying to insert into a MERGE table with no underlying tables
  or no INSERT_METHOD, report that it is read-only.
sql/handler.cc:
  Handle new error message

1 files changed, 16 insertions, 1 deletions

diff --git a/mysql-test/t/merge.test b/mysql-test/t/merge.test
index 400279a826b..9a1980968c5 100644
--- a/mysql-test/t/merge.test
+++ b/mysql-test/t/merge.test
@@ -399,4 +399,19 @@ create table tm (b bit(1)) engine = merge union = (t1,t2);
 select * from tm;
 drop table tm, t1, t2;
 
-# End of 5.0 tests
+#
+# Bug #17766: The server accepts to create MERGE tables which cannot work
+#
+create table t1 (a int) insert_method = last engine = merge;
+--error ER_OPEN_AS_READONLY
+insert into t1 values (1);
+create table t2 (a int) engine = myisam;
+alter table t1 union (t2);
+insert into t1 values (1);
+alter table t1 insert_method = no;
+--error ER_OPEN_AS_READONLY
+insert into t1 values (1);
+drop table t2;
+drop table t1;
+
+--echo End of 5.0 tests