diff --git a/src/Common/Documentation.cpp b/src/Common/Documentation.cpp
new file mode 100644
index 00000000000..862ecb6054c
--- /dev/null
+++ b/src/Common/Documentation.cpp
@@ -0,0 +1,30 @@
+#include <Common/Documentation.h>
+
+namespace DB
+{
+
+std::string Documentation::examplesAsString() const
+{
+    std::string res;
+    for (const auto & [example_name, example_query] : examples)
+    {
+        res += example_name + ":\n\n";
+        res += "```sql\n";
+        res += example_query + "\n";
+        res += "```\n";
+    }
+    return res;
+}
+
+std::string Documentation::categoriesAsString() const
+{
+    if (categories.empty())
+        return "";
+
+    std::string res = categories[0];
+    for (size_t i = 1; i < categories.size(); ++i)
+        res += ", " + categories[i];
+    return res;
+}
+
+}
diff --git a/src/Common/Documentation.h b/src/Common/Documentation.h
index 66ff2a58b5c..c71aa8772ed 100644
--- a/src/Common/Documentation.h
+++ b/src/Common/Documentation.h
@@ -78,29 +78,8 @@ struct Documentation
     /// TODO: Please remove this constructor. Documentation should always be non-empty.
     Documentation() = default;
 
-    std::string examplesAsString() const
-    {
-        std::string res;
-        for (const auto & [example_name, example_query] : examples)
-        {
-            res += example_name + ":\n\n";
-            res += "```sql\n";
-            res += example_query + "\n";
-            res += "```\n";
-        }
-        return res;
-    }
-
-    std::string categoriesAsString() const
-    {
-        if (categories.empty())
-            return "";
-
-        std::string res = categories[0];
-        for (size_t i = 1; i < categories.size(); ++i)
-            res += ", " + categories[i];
-        return res;
-    }
+    std::string examplesAsString() const;
+    std::string categoriesAsString() const;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemFunctions.cpp b/src/Storages/System/StorageSystemFunctions.cpp
index a4773b0be78..f3a297a11d1 100644
--- a/src/Storages/System/StorageSystemFunctions.cpp
+++ b/src/Storages/System/StorageSystemFunctions.cpp
@@ -40,7 +40,6 @@ namespace
         {
             res_columns[2]->insert(false);
             res_columns[3]->insertDefault();
-            res_columns[7]->insert(false);
         }
         else
         {