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, 26 insertions, 0 deletions

diff --git a/mysql-test/main/temp_table.test b/mysql-test/main/temp_table.test
index fb44362b537..a528e27b890 100644
--- a/mysql-test/main/temp_table.test
+++ b/mysql-test/main/temp_table.test
@@ -594,4 +594,30 @@ DROP TABLE nonexisting_table, t1;
 
 --echo # Cleanup
 DROP DATABASE temp_db;
+USE test;
 
+
+--echo #
+--echo # MDEV-17167 - InnoDB: Failing assertion: table->get_ref_count() == 0
+--echo #              upon truncating a temporary table
+--echo #
+CREATE TEMPORARY TABLE t1(a INT) ENGINE=InnoDB;
+SELECT * FROM t1 AS t1a1, t1 AS t2a2;
+TRUNCATE TABLE t1;
+
+LOCK TABLES t1 WRITE;
+TRUNCATE TABLE t1;
+SELECT * FROM t1;
+UNLOCK TABLES;
+
+LOCK TABLES t1 AS t1a1 WRITE, t1 AS t1a2 WRITE;
+TRUNCATE TABLE t1;
+SELECT * FROM t1 AS t1a1, t1 AS t1a2;
+UNLOCK TABLES;
+
+CREATE TABLE t2(a INT) ENGINE=InnoDB;
+LOCK TABLES t2 WRITE;
+TRUNCATE TABLE t1;
+UNLOCK TABLES;
+
+DROP TABLE t1, t2;