SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Function CAST (alias v2) (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal \'String\'
    Function caseWithExpression (alias cond1) (children 1)
     ExpressionList (children 4)
      Literal \'x\'
      Literal \'y\'
      Literal UInt64_0
      Identifier cond2
    Function toNullable (alias cond2) (children 1)
     ExpressionList (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Literal \'1\'
        Identifier v2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function numbers (children 1)
       ExpressionList (children 1)
        Literal UInt64_2
