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, 5 insertions, 0 deletions

diff --git a/mysql-test/include/not_blackhole.inc b/mysql-test/include/not_blackhole.inc
new file mode 100644
index 00000000000..078927ec4ca
--- /dev/null
+++ b/mysql-test/include/not_blackhole.inc
@@ -0,0 +1,5 @@
+if (`SELECT count(*) FROM information_schema.engines WHERE
+     (support = 'YES' OR support = 'DEFAULT') AND
+     engine = 'blackhole'`){
+  skip Blackhole engine enabled;
+}