SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 5)
    Function if (alias d) (children 1)
     ExpressionList (children 3)
      Literal UInt64_1 (alias a)
      Function plus (alias b) (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_2
      Function plus (alias c) (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_3
    Identifier a
    Identifier b
    Identifier c
    Identifier d
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_1
 Identifier TSKV
