Changed-lines coverage:
  PR changed C/C++ lines covered by tests: 95.77% (340/355)

Uncovered changed code (with context):

================================================================================
src/Common/QueryFuzzerDataTypes.cpp
================================================================================

--- uncovered block 81-81 ---
       79 |         return std::make_shared<DataTypeVariant>(variants);
       80 |     }
>>     81 |     return nullptr;
       82 | }
       83 | 

--- uncovered block 145-151 ---
      143 |         if (const auto * type_nested = typeid_cast<const DataTypeNestedCustomName *>(type->getCustomName()))
      144 |         {
>>    145 |             if (fuzz_rand() % 4 != 0)
      146 |             {
>>    147 |                 DataTypes new_elems = type_nested->getElements();
>>    148 |                 fuzzDataTypes(new_elems);
>>    149 |                 return createNested(new_elems, type_nested->getNames());
      150 |             }
>>    151 |             return type;
      152 |         }
      153 | 

--- uncovered block 192-197 ---
      190 |         if (type_tuple->hasExplicitNames())
      191 |         {
>>    192 |             auto names = type_tuple->getElementNames();
      193 |             /// Pad with synthetic names if a field was added, truncate if one was dropped
>>    194 |             while (names.size() < elements.size())
>>    195 |                 names.push_back("f" + std::to_string(names.size()));
>>    196 |             names.resize(elements.size());
>>    197 |             return std::make_shared<DataTypeTuple>(elements, names);
      198 |         }
      199 |         return std::make_shared<DataTypeTuple>(elements);

--- uncovered block 280-283 ---
      278 |         /// Occasionally add a new alternative
      279 |         if (variants.size() < 10 && fuzz_rand() % 4 == 0)
>>    280 |             variants.push_back(getRandomType());
      281 |         /// Occasionally drop an alternative (keep at least 1)
      282 |         if (variants.size() > 1 && fuzz_rand() % 4 == 0)
>>    283 |             variants.erase(variants.begin() + fuzz_rand() % variants.size());
      284 |         return std::make_shared<DataTypeVariant>(variants);
      285 |     }

--- uncovered block 302-302 ---
      300 |         catch (...) // NOLINT(bugprone-empty-catch) Ok: a fuzzed typed-path type may violate an Object invariant
      301 |         {
>>    302 |             return type;
      303 |         }
      304 |     }

--- uncovered block 456-456 ---
      454 |         /// as a quoted literal, so the emitted name no longer reparses. Decline when it does not.
      455 |         if (!DataTypeFactory::instance().tryGet(result->getName()))
>>    456 |             return nullptr;
      457 |         return result;
      458 |     }
WARNING: Failed to get start time for [Print Uncovered Code] - start time and duration won't be set

--- Coverage counts ---
Lines     : baseline 932,853/1,078,435  ->  current 933,770/1,078,901  (delta +917 / +466)
Functions : baseline 805,581/876,781  ->  current 805,744/876,809  (delta +163 / +28)
Branches  : baseline 305,351/387,862  ->  current 305,696/388,136  (delta +345 / +274)