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 sum (alias aaif2) (children 1)
            ExpressionList (children 1)
             Function if (children 1)
              ExpressionList (children 3)
               Function greater (children 1)
                ExpressionList (children 2)
                 Identifier b
                 Literal UInt64_0
               Identifier c
               Literal UInt64_0
          ExpressionList (children 2)
           Identifier a
           Identifier aaif2
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 1)
                 ExpressionList (children 3)
                  Literal UInt64_1 (alias a)
                  Literal UInt64_2 (alias b)
                  Literal UInt64_3 (alias c)
          ExpressionList (children 1)
           Identifier a