MDEV-16725 Add accessor methods for classes in item_timefunc.h

sql/item_timefunc.h

@@ -1079,6 +1079,9 @@ class Item_char_typecast :public Item_str_func
   uint adjusted_length_with_warn(uint length);
   void check_truncation_with_warn(String *src, size_t dstlen);
   void fix_length_and_dec_internal(CHARSET_INFO *fromcs);
+public:
+  // Methods used by ColumnStore
+  uint get_cast_length() const { return cast_length; }
 public:
   Item_char_typecast(THD *thd, Item *a, uint length_arg, CHARSET_INFO *cs_arg):
     Item_str_func(thd, a), cast_length(length_arg), cast_cs(cs_arg),
@@ -1249,6 +1252,9 @@ class Item_func_timestamp :public Item_datetimefunc
 class Item_func_add_time :public Item_handled_func
 {
   int sign;
+public:
+  // Methods used by ColumnStore
+  int get_sign() const { return sign; }
 public:
   Item_func_add_time(THD *thd, Item *a, Item *b, bool neg_arg)
    :Item_handled_func(thd, a, b), sign(neg_arg ? -1 : 1)
@@ -1334,6 +1340,9 @@ class Item_func_timestamp_diff :public Item_longlong_func
   bool check_arguments() const
   { return check_argument_types_can_return_date(0, arg_count); }
   const interval_type int_type;
+public:
+  // Methods used by ColumnStore
+  interval_type get_int_type() const { return int_type; };
 public:
   Item_func_timestamp_diff(THD *thd, Item *a, Item *b, interval_type type_arg):
     Item_longlong_func(thd, a, b), int_type(type_arg) {}