SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function caseWithExpression (children 1)
     ExpressionList (children 6)
      Identifier x
      Literal UInt64_1
      Literal \'hello\'
      Literal UInt64_2
      Literal \'world\'
      Literal \'unknow\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier distributed_00609
