ndb - bug#20612 ins-del fix in tup

storage/ndb/src/kernel/blocks/dbtup/DbtupExecQuery.cpp:
  allocate separate copy tuple for delete after insert or update in same tx, instead of sharing pointer to same copy tuple.  this is an easy fix independent of commit/abort order of operations
mysql-test/r/ndb_dd_basic.result:
  test INS-DEL via assert in disk data code
mysql-test/t/ndb_dd_basic.test:
  test INS-DEL via assert in disk data code

mysql-test/r/ndb_dd_basic.result

@@ -422,6 +422,26 @@ SELECT COUNT(*) FROM t1;
 COUNT(*)
 0
 DROP TABLE t1;
+CREATE TABLE t1 (
+a int NOT NULL,
+b varchar(4000),  -- must use 2 pages undo
+PRIMARY KEY using hash (a)
+)
+TABLESPACE ts1 STORAGE DISK ENGINE=NDBCLUSTER;
+set autocommit = 0;
+insert into t1 values(0,'x');
+insert into t1 values(1,'x');
+insert into t1 values(2,'x');
+insert into t1 values(3,'x');
+insert into t1 values(4,'x');
+insert into t1 values(5,'x');
+insert into t1 values(6,'x');
+insert into t1 values(7,'x');
+insert into t1 values(8,'x');
+delete from t1 where a = 0;
+commit;
+set autocommit = 1;
+drop table t1;
 ALTER TABLESPACE ts1 
 DROP DATAFILE 'datafile.dat' 
 ENGINE = NDB;

mysql-test/t/ndb_dd_basic.test

@@ -345,6 +345,32 @@ DELETE FROM t1 WHERE a=2;
 SELECT COUNT(*) FROM t1;
 DROP TABLE t1;
 
+# bug#20612 INS-DEL bug (not pgman bug)
+# found via disk data assert but is not pgman or disk data related
+
+CREATE TABLE t1 (
+  a int NOT NULL,
+  b varchar(4000),  -- must use 2 pages undo
+  PRIMARY KEY using hash (a)
+)
+TABLESPACE ts1 STORAGE DISK ENGINE=NDBCLUSTER;
+
+set autocommit = 0;
+insert into t1 values(0,'x');
+insert into t1 values(1,'x');
+insert into t1 values(2,'x');
+insert into t1 values(3,'x');
+insert into t1 values(4,'x');
+insert into t1 values(5,'x');
+insert into t1 values(6,'x');
+insert into t1 values(7,'x');
+insert into t1 values(8,'x');
+delete from t1 where a = 0;
+commit;
+set autocommit = 1;
+
+drop table t1;
+
 ###################
 # Test Cleanup
 ###################

storage/ndb/src/kernel/blocks/dbtup/DbtupExecQuery.cpp

@@ -1469,7 +1469,15 @@ int Dbtup::handleDeleteReq(Signal* signal,
   {
     Operationrec* prevOp= req_struct->prevOpPtr.p;
     regOperPtr->tupVersion= prevOp->tupVersion;
-    regOperPtr->m_copy_tuple_location= prevOp->m_copy_tuple_location;
+    // make copy since previous op is committed before this one
+    const Uint32* org = c_undo_buffer.get_ptr(&prevOp->m_copy_tuple_location);
+    Uint32* dst = c_undo_buffer.alloc_copy_tuple(
+        &regOperPtr->m_copy_tuple_location, regTabPtr->total_rec_size);
+    if (dst == 0) {
+      terrorCode = ZMEM_NOMEM_ERROR;
+      goto error;
+    }
+    memcpy(dst, org, regTabPtr->total_rec_size << 2);
   } 
   else 
   {