Bug#46086: crash when dropping a partitioned table

           and the original engine is disabled

Missing check that engine is available.

mysql-test/include/not_blackhole.inc:
  new include file
mysql-test/r/partition_not_blackhole.result:
  new result file
mysql-test/std_data/parts/t1_blackhole.frm:
  blackhole partitioned table .frm file:
  create table `t1` (`id` int primary key) engine=blackhole
  partition by key () partitions 1;
mysql-test/std_data/parts/t1_blackhole.par:
  .par file matching blackhole partitioned .frm
mysql-test/t/partition_not_blackhole-master.opt:
  new master-opt to disable blackhole if compiled in.
mysql-test/t/partition_not_blackhole.test:
  New test
sql/ha_partition.cc:
  Added check that engine is available.

1 files changed, 16 insertions, 0 deletions

diff --git a/mysql-test/r/partition_not_blackhole.result b/mysql-test/r/partition_not_blackhole.result
new file mode 100644
index 00000000000..dc0339f8c48
--- /dev/null
+++ b/mysql-test/r/partition_not_blackhole.result
@@ -0,0 +1,16 @@
+DROP TABLE IF EXISTS t1;
+#
+# Bug#46086: crash when dropping a partitioned table and
+#            the original engine is disabled
+# Copy a .frm and .par file which was created with:
+# create table `t1` (`id` int primary key) engine=blackhole
+# partition by key () partitions 1;
+SHOW TABLES;
+Tables_in_test
+t1
+SHOW CREATE TABLE t1;
+ERROR HY000: Incorrect information in file: './test/t1.frm'
+DROP TABLE t1;
+ERROR 42S02: Unknown table 't1'
+t1.frm
+t1.par