CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration raw_id (children 1)
    DataType String
   ColumnDeclaration columns_n (children 1)
    DataType Nested (children 1)
     ExpressionList (children 2)
      NameTypePair col_1 (children 1)
       DataType Nullable (children 1)
        ExpressionList (children 1)
         DataType String
      NameTypePair col_2 (children 1)
       DataType Nullable (children 1)
        ExpressionList (children 1)
         DataType String
 Storage definition (children 2)
  Function MergeTree
  Identifier raw_id
