BUG#965872: Server crashes in embedding_sjm on a simple 1-table select with AND and OR

- This is a regession introduced by fix for BUG#951937
- The problem was that there were scenarios where check_simple_equality() would create an
  Item_equal object but would not call item_equal->set_context_field() on it. 
- The fix was to add the missing calls.

mysql-test/r/subselect_sj2.result

@@ -1043,6 +1043,15 @@ y	y
 y	y
 DROP VIEW v1;
 DROP TABLE t1, t2;
+# 
+# BUG#965872: Server crashes in embedding_sjm on a simple 1-table select with AND and OR  
+#  (this is a regression caused by the fix for BUG#951937)
+CREATE TABLE t1 ( a INT, b INT, c INT, d INT );
+INSERT INTO t1 VALUES (4,2,8,9),(4,2,7,8);
+SELECT * FROM t1
+WHERE a = d AND ( b = 50 AND b = d OR a = c );
+a	b	c	d
+DROP TABLE t1;
 #
 # BUG#951283: Wrong result (missing rows) with semijoin+firstmatch, IN/ANY subquery
 #

mysql-test/r/subselect_sj2_jcl6.result

@@ -1057,6 +1057,15 @@ y	y
 y	y
 DROP VIEW v1;
 DROP TABLE t1, t2;
+# 
+# BUG#965872: Server crashes in embedding_sjm on a simple 1-table select with AND and OR  
+#  (this is a regression caused by the fix for BUG#951937)
+CREATE TABLE t1 ( a INT, b INT, c INT, d INT );
+INSERT INTO t1 VALUES (4,2,8,9),(4,2,7,8);
+SELECT * FROM t1
+WHERE a = d AND ( b = 50 AND b = d OR a = c );
+a	b	c	d
+DROP TABLE t1;
 #
 # BUG#951283: Wrong result (missing rows) with semijoin+firstmatch, IN/ANY subquery
 #

mysql-test/r/subselect_sj2_mat.result

@@ -1045,6 +1045,15 @@ y	y
 y	y
 DROP VIEW v1;
 DROP TABLE t1, t2;
+# 
+# BUG#965872: Server crashes in embedding_sjm on a simple 1-table select with AND and OR  
+#  (this is a regression caused by the fix for BUG#951937)
+CREATE TABLE t1 ( a INT, b INT, c INT, d INT );
+INSERT INTO t1 VALUES (4,2,8,9),(4,2,7,8);
+SELECT * FROM t1
+WHERE a = d AND ( b = 50 AND b = d OR a = c );
+a	b	c	d
+DROP TABLE t1;
 #
 # BUG#951283: Wrong result (missing rows) with semijoin+firstmatch, IN/ANY subquery
 #

mysql-test/t/subselect_sj2.test

@@ -1175,6 +1175,16 @@ SELECT * FROM t2
 DROP VIEW v1;
 DROP TABLE t1, t2;
 
+--echo # 
+--echo # BUG#965872: Server crashes in embedding_sjm on a simple 1-table select with AND and OR  
+--echo #  (this is a regression caused by the fix for BUG#951937)
+CREATE TABLE t1 ( a INT, b INT, c INT, d INT );
+INSERT INTO t1 VALUES (4,2,8,9),(4,2,7,8);
+
+SELECT * FROM t1
+WHERE a = d AND ( b = 50 AND b = d OR a = c );
+DROP TABLE t1;
+
 --echo #
 --echo # BUG#951283: Wrong result (missing rows) with semijoin+firstmatch, IN/ANY subquery
 --echo #

sql/sql_select.cc

@@ -10788,6 +10788,7 @@ static bool check_simple_equality(Item *left_item, Item *right_item,
         Item_equal *item_equal= new Item_equal(orig_left_item,
                                                orig_right_item,
                                                FALSE);
+        item_equal->set_context_field((Item_field*)left_item);
         cond_equal->current_level.push_back(item_equal);
       }
     }
@@ -10858,6 +10859,7 @@ static bool check_simple_equality(Item *left_item, Item *right_item,
       else
       {
         item_equal= new Item_equal(const_item, orig_field_item, TRUE);
+        item_equal->set_context_field(field_item);
         cond_equal->current_level.push_back(item_equal);
       }
       return TRUE;