SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 6)
   ExpressionList (children 2)
    Function count (children 1)
     ExpressionList
    Identifier key
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier dst
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier step
     Literal UInt64_30
   ExpressionList (children 1)
    Identifier key
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier key
   Literal UInt64_5
