fix for double or decimal to datetime conversion

mysql-test/r/func_time_hires.result

@@ -87,6 +87,11 @@ Warning	1292	Truncated incorrect time value: '-3020399.9999999'
 select 20010101000203.000000004 + interval 1 day;
 20010101000203.000000004 + interval 1 day
 2001-01-02 00:02:03.000000
+Warnings:
+Warning	1292	Truncated incorrect datetime value: '20010101000203.000000004'
+select 20010101000203.4 + interval 1 day;
+20010101000203.4 + interval 1 day
+2001-01-02 00:02:03.4
 set @a=cast('2011-01-02 12:13:14' as datetime);
 select @a + interval 1 minute;
 @a + interval 1 minute

mysql-test/t/func_time_hires.test

@@ -33,6 +33,7 @@ drop table t1;
 select sec_to_time(3020399.99999), sec_to_time(3020399.999999), sec_to_time(3020399.9999999);
 select sec_to_time(-3020399.99999), sec_to_time(-3020399.999999), sec_to_time(-3020399.9999999);
 select 20010101000203.000000004 + interval 1 day;
+select 20010101000203.4 + interval 1 day;
 #
 # precision of expressions
 #

sql/item.cc

@@ -984,7 +984,7 @@ bool Item::get_date(MYSQL_TIME *ltime,uint fuzzydate)
 {
   if (field_type() == MYSQL_TYPE_TIME)
     fuzzydate|= TIME_TIME_ONLY;
-  if (result_type() == STRING_RESULT || fuzzydate & TIME_TIME_ONLY)
+  if (result_type() != INT_RESULT || fuzzydate & TIME_TIME_ONLY)
   {
     char buff[40];
     String tmp(buff,sizeof(buff), &my_charset_bin),*res;