MDEV-8805 - Assertion `!m_ordered_rec_buffer' failed in

            ha_partition::init_record_priority_queue()

Cherry-pick rev.6b0ee0c795499cee7f9deb649fb010801e0be4c2 from mysql-5.6.

Bug #18305270  BACKPORT BUG#18694052 FIX
               FOR ASSERTION `!M_ORDERED_REC_BUFFER'
               FAILED TO 5.6

PROBLEM
-------
Missed to remove record priority queue if
init_index failed for a partition which
was causing the crash.

FIX
---
Remove priority queue if init_index fails
for partition.

mysql-test/r/partition_innodb.result

@@ -765,3 +765,37 @@ f1	f2	f3	f4	f5	f6
 INSERT INTO t3 SELECT * FROM t2 WHERE f3 = 'm' AND f2 ='c';
 DROP TABLE t1,t2,t3;
 set global default_storage_engine=default;
+#
+# Bug#13737949: CRASH IN HA_PARTITION::INDEX_INIT
+# Bug#18694052: SERVER CRASH IN HA_PARTITION::INIT_RECORD_PRIORITY_QUEUE
+#
+CREATE TABLE t1
+(a INT,
+b INT,
+PRIMARY KEY (a))
+ENGINE = InnoDB
+PARTITION BY HASH (a) PARTITIONS 3;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+# con1
+ALTER TABLE t1 ADD INDEX idx1 (b);
+# con default
+SELECT b FROM t1 WHERE b = 0;
+ERROR HY000: Table definition has changed, please retry transaction
+SELECT b FROM t1 WHERE b = 0;
+ERROR HY000: Table definition has changed, please retry transaction
+DROP TABLE t1;
+# Same test without partitioning
+CREATE TABLE t1
+(a INT,
+b INT,
+PRIMARY KEY (a))
+ENGINE = InnoDB;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+# con1
+ALTER TABLE t1 ADD INDEX idx1 (b);
+# con default
+SELECT b FROM t1 WHERE b = 0;
+ERROR HY000: Table definition has changed, please retry transaction
+SELECT b FROM t1 WHERE b = 0;
+ERROR HY000: Table definition has changed, please retry transaction
+DROP TABLE t1;

mysql-test/suite/parts/r/partition_debug.result

@@ -1,5 +1,21 @@
 DROP TABLE IF EXISTS t1;
 #
+# Bug#13737949: CRASH IN HA_PARTITION::INDEX_INIT
+# Bug#18694052: SERVER CRASH IN HA_PARTITION::INIT_RECORD_PRIORITY_QUEUE
+#
+CREATE TABLE t1 (a INT, b VARCHAR(64), KEY(b,a))
+PARTITION BY HASH (a) PARTITIONS 3;
+INSERT INTO t1 VALUES (1, "1"), (2, "2"), (3, "3"), (4, "Four"), (5, "Five"),
+(6, "Six"), (7, "Seven"), (8, "Eight"), (9, "Nine");
+SET SESSION debug_dbug="+d,ha_partition_fail_index_init";
+SELECT * FROM t1 WHERE b = "Seven";
+ERROR HY000: Table has no partition for value 0
+SET SESSION debug_dbug="-d,ha_partition_fail_index_init";
+SELECT * FROM t1 WHERE b = "Seven";
+a	b
+7	Seven
+DROP TABLE t1;
+#
 # WL#4445: EXCHANGE PARTITION WITH TABLE
 # Verify ddl_log in case of crashing.
 call mtr.add_suppression("Attempting backtrace. You can use the following information to find out");

mysql-test/suite/parts/t/partition_debug.test

@@ -12,6 +12,24 @@
 DROP TABLE IF EXISTS t1;
 --enable_warnings
 
+# Partitioning test that require debug features
+
+--echo #
+--echo # Bug#13737949: CRASH IN HA_PARTITION::INDEX_INIT
+--echo # Bug#18694052: SERVER CRASH IN HA_PARTITION::INIT_RECORD_PRIORITY_QUEUE
+--echo #
+CREATE TABLE t1 (a INT, b VARCHAR(64), KEY(b,a))
+  PARTITION BY HASH (a) PARTITIONS 3;
+  INSERT INTO t1 VALUES (1, "1"), (2, "2"), (3, "3"), (4, "Four"), (5, "Five"),
+  (6, "Six"), (7, "Seven"), (8, "Eight"), (9, "Nine");
+SET SESSION debug_dbug="+d,ha_partition_fail_index_init";
+--error ER_NO_PARTITION_FOR_GIVEN_VALUE
+SELECT * FROM t1 WHERE b = "Seven";
+SET SESSION debug_dbug="-d,ha_partition_fail_index_init";
+SELECT * FROM t1 WHERE b = "Seven";
+DROP TABLE t1;
+
+
 --let $DATADIR= `SELECT @@datadir;`
 
 --echo #

mysql-test/t/AAA.test

@@ -0,0 +1,66 @@
+#delimiter |;
+#create procedure p0(x int)
+#while x do
+#  set x = x-1;
+#end while|
+#delimiter ;|
+#call p0(100000000);
+#drop procedure p0;
+#
+#disable_query_log;
+#disable_result_log;
+#let $1= 100000000;
+#while ($1)
+#{
+#  SELECT 1;
+#  dec $1;
+#}
+#enable_query_log;
+#enable_result_log;
+#SELECT 'done';
+
+--source include/have_innodb.inc
+--source include/have_partition.inc
+
+--enable_connect_log
+
+SET GLOBAL innodb_lock_wait_timeout = 3;
+
+CREATE TABLE t1 (pk int auto_increment primary key) ENGINE=InnoDB 
+  PARTITION BY key (pk) partitions 2;
+
+CREATE TABLE t2 (pk int auto_increment primary key) ENGINE=InnoDB;
+
+CREATE TABLE t3 (f int) ENGINE=InnoDB;
+INSERT INTO t3 VALUES (1),(2);
+
+--connect (con1,localhost,root,,test)
+--connect (con2,localhost,root,,test)
+--send ALTER TABLE t1 FORCE;
+
+--connect (con3,localhost,root,,test)
+START TRANSACTION;
+INSERT INTO t2 VALUES (1),(2);
+
+--connection con1
+send UPDATE t3 SET f = 5;
+
+--connection con3
+SELECT f FROM t3;
+
+--connection con1
+reap;
+--error ER_LOCK_WAIT_TIMEOUT
+DELETE FROM t2;
+
+--connection con3
+--error 0,ER_TABLE_DEF_CHANGED
+REPLACE INTO t2 (pk) SELECT NULL FROM t1;
+
+SELECT * FROM t1;
+
+disconnect con1;
+disconnect con2;
+disconnect con3;
+connection default;
+DROP TABLES t1, t2, t3;

mysql-test/t/partition_innodb.test

@@ -856,3 +856,45 @@ INSERT INTO t3 SELECT * FROM t2 WHERE f3 = 'm' AND f2 ='c';
 DROP TABLE t1,t2,t3;
 
 set global default_storage_engine=default;
+
+--echo #
+--echo # Bug#13737949: CRASH IN HA_PARTITION::INDEX_INIT
+--echo # Bug#18694052: SERVER CRASH IN HA_PARTITION::INIT_RECORD_PRIORITY_QUEUE
+--echo #
+CREATE TABLE t1
+(a INT,
+ b INT,
+ PRIMARY KEY (a))
+ ENGINE = InnoDB
+ PARTITION BY HASH (a) PARTITIONS 3;
+ START TRANSACTION WITH CONSISTENT SNAPSHOT;
+ --connect (con1, localhost, root,,)
+ --echo # con1
+ ALTER TABLE t1 ADD INDEX idx1 (b);
+ --connection default
+ --echo # con default
+ --error ER_TABLE_DEF_CHANGED
+ SELECT b FROM t1 WHERE b = 0;
+ --error ER_TABLE_DEF_CHANGED
+ SELECT b FROM t1 WHERE b = 0;
+ --disconnect con1
+ DROP TABLE t1;
+
+--echo # Same test without partitioning
+CREATE TABLE t1
+(a INT,
+ b INT,
+ PRIMARY KEY (a))
+ ENGINE = InnoDB;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+--echo # con1
+--connect (con1, localhost, root,,)
+ALTER TABLE t1 ADD INDEX idx1 (b);
+--connection default
+--echo # con default
+--error ER_TABLE_DEF_CHANGED
+SELECT b FROM t1 WHERE b = 0;
+--error ER_TABLE_DEF_CHANGED
+SELECT b FROM t1 WHERE b = 0;
+--disconnect con1
+DROP TABLE t1;

sql/ha_partition.cc

@@ -5271,6 +5271,7 @@ int ha_partition::index_init(uint inx, bool sorted)
     {
       (void) m_file[j]->ha_index_end();
     }
+    destroy_record_priority_queue();
   }
   DBUG_RETURN(error);
 }