Explain EXPLAIN (children 3)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 5)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t_03176
    ExpressionList (children 1)
     OrderByElement (children 1)
      Identifier k
    Literal UInt64_5
    Set
 Identifier Null
