diff --git a/dbms/src/Columns/ColumnNullable.cpp b/dbms/src/Columns/ColumnNullable.cpp
index d9a8ea4f825..20511ec6bfc 100644
--- a/dbms/src/Columns/ColumnNullable.cpp
+++ b/dbms/src/Columns/ColumnNullable.cpp
@@ -81,9 +81,18 @@ StringRef ColumnNullable::getDataAt(size_t /*n*/) const
     throw Exception{"Method getDataAt is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED};
 }
 
-void ColumnNullable::insertData(const char * /*pos*/, size_t /*length*/)
+void ColumnNullable::insertData(const char * pos, size_t length)
 {
-    throw Exception{"Method insertData is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED};
+    if (pos == nullptr)
+    {
+        getNestedColumn().insertDefault();
+        getNullMapData().push_back(1);
+    }
+    else
+    {
+        getNestedColumn().insertData(pos, length);
+        getNullMapData().push_back(0);
+    }
 }
 
 StringRef ColumnNullable::serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const
diff --git a/dbms/src/Columns/ColumnNullable.h b/dbms/src/Columns/ColumnNullable.h
index 43a6256b1a5..19246cd597d 100644
--- a/dbms/src/Columns/ColumnNullable.h
+++ b/dbms/src/Columns/ColumnNullable.h
@@ -51,6 +51,8 @@ public:
     bool getBool(size_t n) const override { return isNullAt(n) ? 0 : nested_column->getBool(n); }
     UInt64 get64(size_t n) const override { return nested_column->get64(n); }
     StringRef getDataAt(size_t n) const override;
+
+    /// Will insert null value if pos=nullptr
     void insertData(const char * pos, size_t length) override;
     StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override;
     const char * deserializeAndInsertFromArena(const char * pos) override;
diff --git a/dbms/src/Columns/IColumn.h b/dbms/src/Columns/IColumn.h
index 74a1302d094..8839703ac1e 100644
--- a/dbms/src/Columns/IColumn.h
+++ b/dbms/src/Columns/IColumn.h
@@ -141,6 +141,7 @@ public:
     /// Appends data located in specified memory chunk if it is possible (throws an exception if it cannot be implemented).
     /// Is used to optimize some computations (in aggregation, for example).
     /// Parameter length could be ignored if column values have fixed size.
+    /// All data will be inserted as single element
     virtual void insertData(const char * pos, size_t length) = 0;
 
     /// Appends "default value".