Bug#11764994 57900: CREATE TABLE .. SELECT ASSERTS SCALE >= 0 && PRECISION > 0 && SCALE <= PR

Assert fails due to overflow which happens in
Item_func_int_val::fix_num_length_and_dec() as
geometry functions have max_length value equal to
max_field_size(4294967295U). The fix is to skip
max_length calculation for some boundary cases.


mysql-test/r/func_math.result:
  test case
mysql-test/t/func_math.test:
  test case
sql/item_func.cc:
  skip max_length calculation
  if argument max_length is near max_field_size.

mysql-test/r/func_math.result

@@ -511,4 +511,11 @@ t1	CREATE TABLE `t1` (
   `C` varchar(23) DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 DROP TABLE t1;
+#
+# Bug#11764994  57900: CREATE TABLE .. SELECT ASSERTS SCALE >= 0 && PRECISION > 0 && SCALE <= PR
+#
+CREATE TABLE t1 SELECT CEIL(LINESTRINGFROMWKB(1) DIV NULL);
+DROP TABLE t1;
+CREATE TABLE t1 SELECT FLOOR(LINESTRINGFROMWKB(1) DIV NULL);
+DROP TABLE t1;
 End of 5.1 tests

mysql-test/t/func_math.test

@@ -324,4 +324,13 @@ CREATE TABLE t1 SELECT CAST((CASE(('')) WHEN (CONVERT(1, CHAR(1))) THEN (('' / 1
 SHOW CREATE TABLE t1;
 DROP TABLE t1;
 
+--echo #
+--echo # Bug#11764994  57900: CREATE TABLE .. SELECT ASSERTS SCALE >= 0 && PRECISION > 0 && SCALE <= PR
+--echo #
+
+CREATE TABLE t1 SELECT CEIL(LINESTRINGFROMWKB(1) DIV NULL);
+DROP TABLE t1;
+CREATE TABLE t1 SELECT FLOOR(LINESTRINGFROMWKB(1) DIV NULL);
+DROP TABLE t1;
+
 --echo End of 5.1 tests

sql/item_func.cc

@@ -1803,9 +1803,10 @@ void Item_func_integer::fix_length_and_dec()
 
 void Item_func_int_val::fix_num_length_and_dec()
 {
-  max_length= args[0]->max_length - (args[0]->decimals ?
-                                     args[0]->decimals + 1 :
-                                     0) + 2;
+  ulonglong tmp_max_length= (ulonglong ) args[0]->max_length - 
+    (args[0]->decimals ? args[0]->decimals + 1 : 0) + 2;
+  max_length= tmp_max_length > (ulonglong) max_field_size ?
+    max_field_size : (uint32) tmp_max_length;
   uint tmp= float_length(decimals);
   set_if_smaller(max_length,tmp);
   decimals= 0;