merging

mysql-test/r/type_newdecimal.result

@@ -1534,6 +1534,21 @@ select (1.20396873 * 0.89550000 * 0.68000000 * 1.08721696 * 0.99500000 *
 (1.20396873 * 0.89550000 * 0.68000000 * 1.08721696 * 0.99500000 *
 1.01500000 * 1.01500000 * 0.99500000)
 0.812988073953673124592306939480
+create table t1 as select 5.05 / 0.014;
+Warnings:
+Note	1265	Data truncated for column '5.05 / 0.014' at row 1
+show warnings;
+Level	Code	Message
+Note	1265	Data truncated for column '5.05 / 0.014' at row 1
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `5.05 / 0.014` decimal(10,6) default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t1;
+5.05 / 0.014
+360.714286
+DROP TABLE t1;
 End of 5.0 tests
 select cast(143.481 as decimal(4,1));
 cast(143.481 as decimal(4,1))

mysql-test/t/type_newdecimal.test

@@ -1235,6 +1235,16 @@ DROP TABLE t1;
 select (1.20396873 * 0.89550000 * 0.68000000 * 1.08721696 * 0.99500000 *
         1.01500000 * 1.01500000 * 0.99500000);
 
+#
+# Bug #31616 div_precision_increment description looks wrong 
+#
+
+create table t1 as select 5.05 / 0.014;
+show warnings;
+show create table t1;
+select * from t1;
+DROP TABLE t1;
+
 --echo End of 5.0 tests
 
 #

sql/item_func.cc

@@ -1301,8 +1301,10 @@ my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
 
 void Item_func_div::result_precision()
 {
-  uint arg_prec= args[0]->decimal_precision() + prec_increment;
-  uint precision=min(arg_prec, DECIMAL_MAX_PRECISION);
+  uint precision=min(args[0]->decimal_precision() + 
+                     args[1]->decimals + prec_increment,
+                     DECIMAL_MAX_PRECISION);
+
   /* Integer operations keep unsigned_flag if one of arguments is unsigned */
   if (result_type() == INT_RESULT)
     unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;