diff --git a/dbms/src/Dictionaries/CacheDictionary.cpp b/dbms/src/Dictionaries/CacheDictionary.cpp
index 8c13da764e209b6905c67ce1eff6f6b29d0043d1..012e4192f96a887b6119b1e41754c6ae68ac4608 100644
--- a/dbms/src/Dictionaries/CacheDictionary.cpp
+++ b/dbms/src/Dictionaries/CacheDictionary.cpp
@@ -976,7 +976,7 @@ PaddedPODArray<CacheDictionary::Key> CacheDictionary::getCachedIds() const
     PaddedPODArray<Key> array;
     for (size_t idx = 0; idx < cells.size(); ++idx)
     {
-        auto& cell = cells[idx];
+        auto & cell = cells[idx];
         if (!isEmptyCell(idx))
         {
             array.push_back(cell.id);
diff --git a/dbms/src/Dictionaries/CacheDictionary.h b/dbms/src/Dictionaries/CacheDictionary.h
index c68aca78052e0d26db92b337653d428512f1676d..59c390fd98906bacfe2fe6edb971b65edb3c6dab 100644
--- a/dbms/src/Dictionaries/CacheDictionary.h
+++ b/dbms/src/Dictionaries/CacheDictionary.h
@@ -16,7 +16,6 @@
 #include <tuple>
 #include <random>
 
-class A;
 
 namespace DB
 {
diff --git a/dbms/src/Dictionaries/ComplexKeyHashedDictionary.cpp b/dbms/src/Dictionaries/ComplexKeyHashedDictionary.cpp
index 73015950f529b6d588d2b53ac666854c3a411051..dbd9a503b188f2600ea1a0c5e94f90657321f6d8 100644
--- a/dbms/src/Dictionaries/ComplexKeyHashedDictionary.cpp
+++ b/dbms/src/Dictionaries/ComplexKeyHashedDictionary.cpp
@@ -505,7 +505,7 @@ void ComplexKeyHashedDictionary::has(const Attribute & attribute, const Columns
 
 std::vector<StringRef> ComplexKeyHashedDictionary::getKeys() const
 {
-    const Attribute& attribute = attributes.front();
+    const Attribute & attribute = attributes.front();
 
     switch (attribute.type)
     {
@@ -525,7 +525,7 @@ std::vector<StringRef> ComplexKeyHashedDictionary::getKeys() const
 }
 
 template <typename T>
-std::vector<StringRef> ComplexKeyHashedDictionary::getKeys(const Attribute& attribute) const
+std::vector<StringRef> ComplexKeyHashedDictionary::getKeys(const Attribute & attribute) const
 {
     const ContainerType<T> & attr = *std::get<ContainerPtrType<T>>(attribute.maps);
     std::vector<StringRef> keys;
diff --git a/dbms/src/Dictionaries/ComplexKeyHashedDictionary.h b/dbms/src/Dictionaries/ComplexKeyHashedDictionary.h
index c5ab31cd398c65197227d651923875a41bb53a67..f8936b246a0e9ea960faf386e12c9fb5beef0486 100644
--- a/dbms/src/Dictionaries/ComplexKeyHashedDictionary.h
+++ b/dbms/src/Dictionaries/ComplexKeyHashedDictionary.h
@@ -194,7 +194,7 @@ private:
     std::vector<StringRef> getKeys() const;
 
     template <typename T>
-    std::vector<StringRef> getKeys(const Attribute& attribute) const;
+    std::vector<StringRef> getKeys(const Attribute & attribute) const;
 
     const std::string name;
     const DictionaryStructure dict_struct;
diff --git a/dbms/src/Dictionaries/DictionaryBlockInputStreamBase.cpp b/dbms/src/Dictionaries/DictionaryBlockInputStreamBase.cpp
index 7e856aa4d206c976cb0e9df56016cb347b7d6e9e..468d91a231d4a6491f0575272a576fe6224c79f9 100644
--- a/dbms/src/Dictionaries/DictionaryBlockInputStreamBase.cpp
+++ b/dbms/src/Dictionaries/DictionaryBlockInputStreamBase.cpp
@@ -11,7 +11,7 @@ DictionaryBlockInputStreamBase::DictionaryBlockInputStreamBase(size_t rows_count
 String DictionaryBlockInputStreamBase::getID() const
 {
     std::stringstream ss;
-    ss << static_cast<const void*> (this);
+    ss << static_cast<const void*>(this);
     return ss.str();
 }