diff --git a/mysql-test/r/partition.result b/mysql-test/r/partition.result
index 9aa2dd418f8..77c1778fc55 100644
--- a/mysql-test/r/partition.result
+++ b/mysql-test/r/partition.result
@@ -2111,4 +2111,24 @@ COUNT(*)
 0
 DROP TABLE t1;
 SET SESSION SQL_MODE=DEFAULT;
+#
+# Bug#46198: Hang after failed ALTER TABLE on partitioned table.
+#
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (s1 INT PRIMARY KEY) PARTITION BY HASH(s1);
+LOCK TABLES t1 WRITE, t1 b READ;
+UNLOCK TABLES;
+ALTER TABLE t1 DROP PARTITION p1;
+ERROR HY000: DROP PARTITION can only be used on RANGE/LIST partitions
+SELECT * FROM t1;
+s1
+DROP TABLE t1;
+CREATE TABLE t1 (s1 VARCHAR(5) PRIMARY KEY) PARTITION BY KEY(s1);
+LOCK TABLES t1 WRITE, t1 b READ;
+UNLOCK TABLES;
+ALTER TABLE t1 ADD COLUMN (s3 VARCHAR(5) UNIQUE);
+ERROR HY000: A UNIQUE INDEX must include all columns in the table's partitioning function
+SELECT * FROM t1;
+s1
+DROP TABLE t1;
 End of 5.1 tests
diff --git a/mysql-test/r/variables_debug.result b/mysql-test/r/variables_debug.result
index 9cd133dddb1..89a3202b731 100644
--- a/mysql-test/r/variables_debug.result
+++ b/mysql-test/r/variables_debug.result
@@ -10,3 +10,10 @@ set debug= '-P';
 select @@debug;
 @@debug
 T
+SELECT @@session.debug, @@global.debug;
+@@session.debug	@@global.debug
+T	
+SET SESSION debug = '';
+SELECT @@session.debug, @@global.debug;
+@@session.debug	@@global.debug
+	
diff --git a/mysql-test/t/partition.test b/mysql-test/t/partition.test
index 18b7e0d343b..4b7be00148f 100644
--- a/mysql-test/t/partition.test
+++ b/mysql-test/t/partition.test
@@ -2118,4 +2118,49 @@ SET SESSION SQL_MODE=DEFAULT;
 #SELECT  1 FROM t1 JOIN t1 AS t2 USING (a) FOR UPDATE;
 #
 #DROP TABLE t1;
+
+--echo #
+--echo # Bug#46198: Hang after failed ALTER TABLE on partitioned table.
+--echo #
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+#
+# Case 1.
+#
+
+CREATE TABLE t1 (s1 INT PRIMARY KEY) PARTITION BY HASH(s1);
+
+LOCK TABLES t1 WRITE, t1 b READ;
+
+UNLOCK TABLES;
+
+--error ER_ONLY_ON_RANGE_LIST_PARTITION
+ALTER TABLE t1 DROP PARTITION p1;
+
+# The SELECT below used to hang in tdc_wait_for_old_versions().
+SELECT * FROM t1;
+
+DROP TABLE t1;
+
+#
+# Case 2.
+#
+
+CREATE TABLE t1 (s1 VARCHAR(5) PRIMARY KEY) PARTITION BY KEY(s1);
+
+LOCK TABLES t1 WRITE, t1 b READ;
+
+UNLOCK TABLES;
+
+--error ER_UNIQUE_KEY_NEED_ALL_FIELDS_IN_PF
+ALTER TABLE t1 ADD COLUMN (s3 VARCHAR(5) UNIQUE);
+
+# The SELECT below used to hang in tdc_wait_for_old_versions().
+SELECT * FROM t1;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests
diff --git a/mysql-test/t/variables_debug.test b/mysql-test/t/variables_debug.test
index 7dcaf246803..dac85345136 100644
--- a/mysql-test/t/variables_debug.test
+++ b/mysql-test/t/variables_debug.test
@@ -10,3 +10,13 @@ set debug= '+P';
 select @@debug;
 set debug= '-P';
 select @@debug;
+
+#
+# Bug#38054: "SET SESSION debug" modifies @@global.debug variable
+#
+
+SELECT @@session.debug, @@global.debug;
+
+SET SESSION debug = '';
+
+SELECT @@session.debug, @@global.debug;