CreateQuery han_1 (children 3)
 Identifier han_1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration k (children 1)
    DataType Int32
   ColumnDeclaration date_dt (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier k
  Identifier k
