[chore](jsonb) remove unused code from jsonb_document (apache#56496)

Author: Mryange

be/src/util/jsonb_document.h

@@ -486,10 +486,6 @@ class JsonbFwdIteratorT {
 private:
     iterator current_;
 };
-
-using hDictInsert = int (*)(const char*, unsigned int);
-using hDictFind = int (*)(const char*, unsigned int);
-
 using JsonbTypeUnder = std::underlying_type_t<JsonbType>;
 
 #if defined(__clang__)
@@ -856,22 +852,6 @@ struct JsonbStringVal : public JsonbBinaryVal {
         // It's shorter than the size of payload
         return strnlen(payload, size);
     }
-    // convert the string (case insensitive) to a boolean value
-    // "false": 0
-    // "true": 1
-    // all other strings: -1
-    int getBoolVal() {
-        if (size == 4 && tolower(payload[0]) == 't' && tolower(payload[1]) == 'r' &&
-            tolower(payload[2]) == 'u' && tolower(payload[3]) == 'e') {
-            return 1;
-        } else if (size == 5 && tolower(payload[0]) == 'f' && tolower(payload[1]) == 'a' &&
-                   tolower(payload[2]) == 'l' && tolower(payload[3]) == 's' &&
-                   tolower(payload[4]) == 'e') {
-            return 0;
-        } else {
-            return -1;
-        }
-    }
 };
 
 /*