SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias V) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 4)
          ExpressionList (children 2)
           Function plus (alias aa) (children 1)
            ExpressionList (children 2)
             Identifier a
             Literal UInt64_1
           Function sumIf (alias aaif) (children 1)
            ExpressionList (children 2)
             Identifier aa
             Function greater (children 1)
              ExpressionList (children 2)
               Identifier b
               Literal UInt64_0
          ExpressionList (children 2)
           Identifier a
           Identifier aaif
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 1)
                 ExpressionList (children 2)
                  Literal UInt64_1 (alias a)
                  Literal UInt64_2 (alias b)
          ExpressionList (children 1)
           Identifier a