SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 3)
    Function toStartOfHour (alias d1) (children 1)
     ExpressionList (children 1)
      Identifier d
    Function min (children 1)
     ExpressionList (children 1)
      Identifier a
    Function max (children 1)
     ExpressionList (children 1)
      Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier pk_order
   ExpressionList (children 1)
    Identifier d1
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier d1
   Literal UInt64_5
