Fixed bug #26124: SELECT from a view wrapper over a table

with a column of the DATETIME type could return a wrong 
result set if the WHERE clause included a BETWEEN condition
on the column.
Fixed the method Item_func_between::fix_length_and_dec
where the aggregation type for BETWEEN predicates calculated
incorrectly if the first argument was a view column of the
DATETIME type.

mysql-test/r/view.result

@@ -3034,4 +3034,22 @@ SHOW CREATE VIEW v1;
 View	Create View
 v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select _latin1'The\ZEnd' AS `TheEnd`
 DROP VIEW v1;
+CREATE TABLE t1 (mydate DATETIME);
+INSERT INTO t1 VALUES 
+('2007-01-01'), ('2007-01-02'), ('2007-01-30'), ('2007-01-31');
+CREATE VIEW v1 AS SELECT mydate from t1;
+SELECT * FROM t1 WHERE mydate BETWEEN '2007-01-01' AND '2007-01-31';
+mydate
+2007-01-01 00:00:00
+2007-01-02 00:00:00
+2007-01-30 00:00:00
+2007-01-31 00:00:00
+SELECT * FROM v1 WHERE mydate BETWEEN '2007-01-01' AND '2007-01-31';
+mydate
+2007-01-01 00:00:00
+2007-01-02 00:00:00
+2007-01-30 00:00:00
+2007-01-31 00:00:00
+DROP VIEW v1;
+DROP TABLE t1;
 End of 5.0 tests.

mysql-test/t/view.test

@@ -2986,4 +2986,20 @@ SHOW CREATE VIEW v1;
 
 DROP VIEW v1;
 
+#
+# Bug #26124: BETWEEN over a view column of the DATETIME type
+#
+
+CREATE TABLE t1 (mydate DATETIME);
+INSERT INTO t1 VALUES 
+  ('2007-01-01'), ('2007-01-02'), ('2007-01-30'), ('2007-01-31');
+
+CREATE VIEW v1 AS SELECT mydate from t1;
+
+SELECT * FROM t1 WHERE mydate BETWEEN '2007-01-01' AND '2007-01-31';
+SELECT * FROM v1 WHERE mydate BETWEEN '2007-01-01' AND '2007-01-31';
+
+DROP VIEW v1;
+DROP TABLE t1;
+
 --echo End of 5.0 tests.

sql/item_cmpfunc.cc

@@ -1185,11 +1185,11 @@ void Item_func_between::fix_length_and_dec()
     They are compared as integers, so for const item this time-consuming
     conversion can be done only once, not for every single comparison
   */
-  if (args[0]->type() == FIELD_ITEM &&
+  if (args[0]->real_item()->type() == FIELD_ITEM &&
       thd->lex->sql_command != SQLCOM_CREATE_VIEW &&
       thd->lex->sql_command != SQLCOM_SHOW_CREATE)
   {
-    Field *field=((Item_field*) args[0])->field;
+    Field *field=((Item_field*) (args[0]->real_item()))->field;
     if (field->can_be_compared_as_longlong())
     {
       /*