SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier 03578_keepermap_nullable
   Function in (children 1)
    ExpressionList (children 2)
     Identifier key
     Literal Tuple_(NULL, UInt64_1)
   ExpressionList (children 2)
    OrderByElement (children 1)
     Literal UInt64_1
    OrderByElement (children 1)
     Literal UInt64_2
   Set
