CreateQuery pk_set (children 3)
 Identifier pk_set
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration d (children 1)
    DataType Date
   ColumnDeclaration n (children 1)
    DataType UInt64
   ColumnDeclaration host (children 1)
    DataType String
   ColumnDeclaration code (children 1)
    DataType UInt64
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 3)
    Identifier d
    Function tuple (children 1)
     ExpressionList (children 3)
      Identifier n
      Identifier host
      Identifier code
    Literal UInt64_1