SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Identifier a
    Function sumMerge (alias sum_b) (children 1)
     ExpressionList (children 1)
      Identifier sum_b
    Function uniqMerge (alias uniq_b) (children 1)
     ExpressionList (children 1)
      Identifier uniq_b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier mv_dst
   ExpressionList (children 1)
    Identifier a
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier a
