SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function multiIf (alias a) (children 1)
     ExpressionList (children 5)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier value
        Literal \'1\'
      Literal \'ValueFirst\'
      Function greater (children 1)
       ExpressionList (children 2)
        Literal UInt64_2
        Literal UInt64_1
      Literal \'ValueSecond\'
      Literal \'ElseValue\'
    Function isConstant (children 1)
     ExpressionList (children 1)
      Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier multi_if_check
