MDEV-36235 Incorrect result for BETWEEN over unique blob prefix

Disallow range optimization for BETWEEN when casting one of the arguments
from STRING to a numeric type would be required to construct a range for
the query.

Adds a new method on Item_func_between called can_optimize_range_const
which allows range optimization when the types of the arguments to BETWEEN
would permit it.

sql/item_cmpfunc.h

@@ -1003,6 +1003,23 @@ public:
 
 class Item_func_between :public Item_func_opt_neg
 {
+  /*
+    If the types of the arguments to BETWEEN permit, then:
+
+    WHERE const1 BETWEEN expr2 AND field1
+      can be optimized as if it was just:
+    WHERE const1 <= field1
+
+    as expr2 could be an arbitrary expression.  More generally,
+    this optimization is permitted if aggregation for comparison
+    for three expressions (const1,const2,field1) and for two
+    expressions (const1,field1) return the same type handler.
+
+    @param [IN] field_item - This is a field from the right side
+                             of the BETWEEN operator.
+   */
+  bool can_optimize_range_const(Item_field *field_item) const;
+
 protected:
   SEL_TREE *get_func_mm_tree(RANGE_OPT_PARAM *param,
                              Field *field, Item *value) override;