MDEV-17167 - InnoDB: Failing assertion: table->get_ref_count() == 0 uponmariadb-10.3.10

             truncating a temporary table

TRUNCATE expects only one TABLE instance (which is used by TRUNCATE
itself) to be open. However this requirement wasn't enforced after
"MDEV-5535: Cannot reopen temporary table".

Fixed by closing unused table instances before performing TRUNCATE.

1 files changed, 6 insertions, 1 deletions

diff --git a/sql/sql_plist.h b/sql/sql_plist.h
index bb9889cc534..4d279af7a0d 100644
--- a/sql/sql_plist.h
+++ b/sql/sql_plist.h
@@ -184,7 +184,12 @@ public:
     list= &a;
     current= a.m_first;
   }
-  /* Operator for it++ */
+  /**
+    Operator for it++
+
+    @note since we save next element pointer, caller may remove current element.
+    Such modification doesn't invalidate iterator.
+  */
   inline T* operator++(int)
   {
     T *result= current;