CreateQuery pk_order (children 3)
 Identifier pk_order
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration d (children 1)
    DataType DateTime
   ColumnDeclaration a (children 1)
    DataType Int32
   ColumnDeclaration b (children 1)
    DataType Int32
 Storage definition (children 4)
  Function MergeTree
  Function toDate (children 1)
   ExpressionList (children 1)
    Identifier d
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier d
    Identifier a
  Set
