Fixed bug mdev-11907.

With the current design the function copy_funcs() should ignore
the items with window functions from the array **func_ptr.

mysql-test/r/win.result

@@ -2270,17 +2270,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.6667
 10	2	1.0000
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 create view v1 as select pk, c, c/count(*) over (partition by c order by pk
 rows between 1 preceding and 2 following) as CNT
 from t1;
@@ -2299,17 +2288,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.6667
 10	2	1.0000
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 select pk, c, c/count(*) over w1 as CNT from t1
 window w1 as (partition by c order by pk rows between 1 preceding and 2 following);
 pk	c	CNT
@@ -2323,17 +2301,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.6667
 10	2	1.0000
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 create view v2 as select pk, c, c/count(*) over w1 as CNT from t1
 window w1 as (partition by c order by pk rows between 1 preceding and 2 following);
 show create view v2;
@@ -2351,17 +2318,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.6667
 10	2	1.0000
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 select pk, c, c/count(*) over w1 as CNT from t1
 window w1 as (partition by c order by pk rows unbounded preceding);
 pk	c	CNT
@@ -2375,17 +2331,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.4000
 10	2	0.3333
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 create view v3 as select pk, c, c/count(*) over w1 as CNT from t1
 window w1 as (partition by c order by pk rows unbounded preceding);
 show create view v3;
@@ -2403,17 +2348,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.4000
 10	2	0.3333
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 select pk, c, c/count(*) over (partition by c order by pk
 range between 3 preceding and current row) as CNT
 from t1;
@@ -2428,17 +2362,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.5000
 10	2	0.5000
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 create view v4 as select pk, c, c/count(*) over (partition by c order by pk
 range between 3 preceding and current row) as CNT
 from t1;
@@ -2457,17 +2380,6 @@ pk	c	CNT
 8	2	0.5000
 9	2	0.5000
 10	2	0.5000
-Warnings:
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
-Warning	1365	Division by 0
 drop view v1,v2,v3,v4;
 drop table t0,t1;
 #
@@ -3096,3 +3008,24 @@ select i, rank() over (order by i) rnk from t1 group by 1+2;
 i	rnk
 2	1
 drop table t1;
+#
+# MDEV-11907: window function as the second operand of division
+#
+create table t1 (pk int, c int);
+insert into t1 values (1,1),(2,1),(3,1),(4,1),(5,2);
+set @sql_mode_save= @@sql_mode;
+set sql_mode='ERROR_FOR_DIVISION_BY_ZERO';
+select pk, c, c/count(*) over 
+(partition by c order by pk
+rows between 1 preceding and 2 following) as CNT
+from t1;
+pk	c	CNT
+1	1	0.3333
+2	1	0.2500
+3	1	0.3333
+4	1	0.5000
+5	2	2.0000
+show warnings;
+Level	Code	Message
+set sql_mode=@sql_mode_save;
+drop table t1;

mysql-test/t/win.test

@@ -1809,3 +1809,24 @@ select i, row_number() over () from t1 group by 1+2;
 select i, rank() over (order by i) rnk from t1 group by 1+2;
 
 drop table t1;
+
+--echo #
+--echo # MDEV-11907: window function as the second operand of division
+--echo #
+
+create table t1 (pk int, c int);
+insert into t1 values (1,1),(2,1),(3,1),(4,1),(5,2);
+
+set @sql_mode_save= @@sql_mode;
+set sql_mode='ERROR_FOR_DIVISION_BY_ZERO';
+
+select pk, c, c/count(*) over 
+           (partition by c order by pk
+            rows between 1 preceding and 2 following) as CNT
+from t1;
+show warnings;
+
+set sql_mode=@sql_mode_save;
+
+drop table t1;
+

sql/sql_select.cc

@@ -23338,6 +23338,9 @@ copy_funcs(Item **func_ptr, const THD *thd)
   Item *func;
   for (; (func = *func_ptr) ; func_ptr++)
   {
+    if (func->type() == Item::FUNC_ITEM &&
+        ((Item_func *) func)->with_window_func)
+      continue;
     func->save_in_result_field(1);
     /*
       Need to check the THD error state because Item::val_xxx() don't