Bug#9719: DELETE with WHERE on HEAP table just deletes first row of matched

set.

(Ramil's patch, recreated.)


heap/hp_delete.c:
  Reset info->lastkey_len for further heap_rnext/heap_rprev calls.
mysql-test/r/heap_btree.result:
  Test for bug #9719: DELETE with WHERE on HEAP table just deletes first 
  row of matched set.
mysql-test/t/heap_btree.test:
  Test for bug #9719: DELETE with WHERE on HEAP table just deletes first 
  row of matched set.

heap/hp_delete.c

@@ -73,7 +73,10 @@ int hp_rb_delete_key(HP_INFO *info, register HP_KEYDEF *keyinfo,
   int res;
 
   if (flag) 
+  {
     info->last_pos= NULL; /* For heap_rnext/heap_rprev */
+    info->lastkey_len= 0;
+  }
 
   custom_arg.keyseg= keyinfo->seg;
   custom_arg.key_length= hp_rb_make_key(keyinfo, info->recbuf, record, recpos);

mysql-test/r/heap_btree.result

@@ -246,3 +246,38 @@ DELETE from t1 where a < 100;
 SELECT * from t1;
 a
 DROP TABLE t1;
+create table t1(a int not null, key using btree(a)) engine=heap;
+insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
+select a from t1 where a > 2;
+a
+3
+3
+3
+3
+delete from t1 where a < 4;
+select a from t1;
+a
+insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
+select a from t1 where a > 4;
+a
+delete from t1 where a > 4;
+select a from t1;
+a
+3
+3
+1
+3
+3
+1
+2
+2
+2
+select a from t1 where a > 3;
+a
+delete from t1 where a >= 2;
+select a from t1;
+a
+1
+1
+drop table t1;
+End of 4.1 tests

mysql-test/t/heap_btree.test

@@ -164,4 +164,22 @@ DELETE from t1 where a < 100;
 SELECT * from t1;
 DROP TABLE t1;
 
-# End of 4.1 tests
+#
+# Bug #9719: problem with delete
+#
+
+create table t1(a int not null, key using btree(a)) engine=heap;
+insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
+select a from t1 where a > 2;
+delete from t1 where a < 4;
+select a from t1;
+insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
+select a from t1 where a > 4;
+delete from t1 where a > 4;
+select a from t1;
+select a from t1 where a > 3;
+delete from t1 where a >= 2;
+select a from t1;
+drop table t1;
+
+--echo End of 4.1 tests