CreateQuery source (children 3)
 Identifier source
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration timestamp (children 1)
    DataType DateTime
   ColumnDeclaration card_id (children 1)
    DataType UInt64
   ColumnDeclaration _id (children 1)
    DataType String
 Storage definition (children 4)
  Function MergeTree
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Identifier timestamp
  Identifier _id
  ExpressionList (children 1)
   TTLElement (children 1)
    Function toDateTime (children 1)
     ExpressionList (children 1)
      Function plus (children 1)
       ExpressionList (children 2)
        Identifier timestamp
        Function toIntervalDay (children 1)
         ExpressionList (children 1)
          Literal UInt64_7
