From 664f24d5c36301e98e82e626ead768bdd4b0d13a Mon Sep 17 00:00:00 2001
From: "gkodinov/kgeorge@macbook.gmz" <>
Date: Wed, 14 Feb 2007 18:35:59 +0200
Subject: [PATCH] Bug#19717: The blackhole engine is returning an OK flag in
 index_read(), whereas it must return HA_ERR_END_OF_FILE instead (as there are
 by definition no rows in a table of that engine.

---
 mysql-test/r/blackhole.result | 11 +++++++++++
 mysql-test/t/blackhole.test   | 15 +++++++++++++++
 sql/ha_blackhole.cc           |  2 +-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/mysql-test/r/blackhole.result b/mysql-test/r/blackhole.result
index 140d7e73d48..0ee5f326e0f 100644
--- a/mysql-test/r/blackhole.result
+++ b/mysql-test/r/blackhole.result
@@ -123,3 +123,14 @@ master-bin.000001	#	Query	1	#	use `test`; create table t3 like t1
 master-bin.000001	#	Query	1	#	use `test`; insert into t1 select * from t3
 master-bin.000001	#	Query	1	#	use `test`; replace into t1 select * from t3
 drop table t1,t2,t3;
+CREATE TABLE t1(a INT, b INT) ENGINE=BLACKHOLE;
+DELETE FROM t1 WHERE a=10;
+ALTER TABLE t1 ADD INDEX(a);
+DELETE FROM t1 WHERE a=10;
+ALTER TABLE t1 DROP INDEX a;
+ALTER TABLE t1 ADD UNIQUE INDEX(a);
+DELETE FROM t1 WHERE a=10;
+ALTER TABLE t1 DROP INDEX a;
+ALTER TABLE t1 ADD PRIMARY KEY(a);
+DELETE FROM t1 WHERE a=10;
+DROP TABLE t1;
diff --git a/mysql-test/t/blackhole.test b/mysql-test/t/blackhole.test
index e40b84eb5cd..4bafad2d777 100644
--- a/mysql-test/t/blackhole.test
+++ b/mysql-test/t/blackhole.test
@@ -127,4 +127,19 @@ show binlog events;
 
 drop table t1,t2,t3;
 
+#
+#Bug#19717: DELETE Query Error on BLACKHOLE when using WHERE on column with UNIQUE INDEX
+#
+CREATE TABLE t1(a INT, b INT) ENGINE=BLACKHOLE;
+DELETE FROM t1 WHERE a=10;
+ALTER TABLE t1 ADD INDEX(a);
+DELETE FROM t1 WHERE a=10;
+ALTER TABLE t1 DROP INDEX a;
+ALTER TABLE t1 ADD UNIQUE INDEX(a);
+DELETE FROM t1 WHERE a=10;
+ALTER TABLE t1 DROP INDEX a;
+ALTER TABLE t1 ADD PRIMARY KEY(a);
+DELETE FROM t1 WHERE a=10;
+DROP TABLE t1;
+
 # End of 4.1 tests
diff --git a/sql/ha_blackhole.cc b/sql/ha_blackhole.cc
index 61a8658be53..3f4285ec595 100644
--- a/sql/ha_blackhole.cc
+++ b/sql/ha_blackhole.cc
@@ -180,7 +180,7 @@ int ha_blackhole::index_read(byte * buf, const byte * key,
                              uint key_len, enum ha_rkey_function find_flag)
 {
   DBUG_ENTER("ha_blackhole::index_read");
-  DBUG_RETURN(0);
+  DBUG_RETURN(HA_ERR_END_OF_FILE);
 }