SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function nested (alias n) (children 1)
     ExpressionList (children 3)
      Literal Array_[Array_[\'click\'], Array_[\'house\']]
      Identifier x.b.first
      Identifier x.b.second
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier n
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
