SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier col1
    Function multiIf (alias t) (children 1)
     ExpressionList (children 3)
      Function in (children 1)
       ExpressionList (children 2)
        Identifier col1
        Literal Tuple_(\'a\', \'b\')
      Literal UInt64_1
      Literal NULL
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier t
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test1_00395