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Re: [PATCH 08/13] reftable/merged: simplify indices for subiterators

From
Patrick Steinhardt <ps@pks.im>
Date
May 13, 2024, 08:36 UTC
Message-ID
<ZkHRApu7WvdihQBe@tanuki>
In-Reply-To
<uecirknp6pdo5amkv6kvfvxryiptqrgblttbu6dhz3vh74obzd@7dwnx3agsllr>
On Fri, May 10, 2024 at 02:25:09PM -0500, Justin Tobler wrote:
Show 5 quoted lines
> On 24/05/08 01:04PM, Patrick Steinhardt wrote:
> > When seeking on a merged table, we perform the seek for each of the
> > subiterators. If the subiterator hasa the desired record we add it to
> 
> s/hasa/has/
Fixed.
Show 15 quoted lines
> > the priority queue, otherwise we skip it and don't add it to the stack
> > of subiterators hosted by the merged table.
> > 
> > The consequence of this is that the index of the subiterator in the
> > merged table does not necessarily correspond to the index of it in the
> > merged iterator. Next to being potentially confusing, it also means that
> > we won't easily be able to re-seek the merged iterator because we have
> > no clear connection between both of the data structures.
> 
> Ah, I also found this a bit confusing. I think this is a good change.
> > 
> > Refactor the code so that the index stays the same in both structures.
> 
> Was there any advantage to not adding subiterators to the stack
> originally? It looks like it adding them doesn't affect anything.
Not to the best of my knowledge, no.
Patrick
Previous: Justin ToblerNext: Patrick Steinhardt
Message 13 of 50 in “reftable: prepare for re-seekable iterators”
  1. 00/13 reftable: prepare for re-seekable iteratorsPatrick Steinhardt, May 8, 2024
  2. 01/13 reftable/block: use `size_t` to track restart point indexPatrick Steinhardt, May 8, 2024
  3. 02/13 reftable/reader: avoid copying index iteratorPatrick Steinhardt, May 8, 2024
  4. 03/13 reftable/reader: unify indexed and linear seekingPatrick Steinhardt, May 8, 2024
  5. 04/13 reftable/reader: separate concerns of table iter and reftable readerPatrick Steinhardt, May 8, 2024
  6. 05/13 reftable/reader: inline `reader_seek_internal()`Patrick Steinhardt, May 8, 2024
  7. 06/13 reftable/reader: set up the reader when initializing table iteratorPatrick Steinhardt, May 8, 2024
  8. 07/13 reftable/merged: split up initialization and seeking of recordsPatrick Steinhardt, May 8, 2024
  9. Justin ToblerMay 10, 2024
  10. Patrick SteinhardtMay 13, 2024
  11. 08/13 reftable/merged: simplify indices for subiteratorsPatrick Steinhardt, May 8, 2024
  12. Justin ToblerMay 10, 2024
  13. Patrick SteinhardtMay 13, 2024
  14. 09/13 reftable/generic: move seeking of records into the iteratorPatrick Steinhardt, May 8, 2024
  15. Justin ToblerMay 10, 2024
  16. Patrick SteinhardtMay 13, 2024
  17. 10/13 reftable/generic: adapt interface to allow reuse of iteratorsPatrick Steinhardt, May 8, 2024
  18. 11/13 reftable/reader: adapt interface to allow reuse of iteratorsPatrick Steinhardt, May 8, 2024
  19. Justin ToblerMay 10, 2024
  20. Patrick SteinhardtMay 13, 2024
  21. 12/13 reftable/stack: provide convenience functions to create iteratorsPatrick Steinhardt, May 8, 2024
  22. 13/13 reftable/merged: adapt interface to allow reuse of iteratorsPatrick Steinhardt, May 8, 2024
  23. Junio C HamanoMay 8, 2024
  24. Junio C HamanoMay 9, 2024
  25. Patrick SteinhardtMay 10, 2024
  26. Junio C HamanoMay 10, 2024
  27. Patrick SteinhardtMay 10, 2024
  28. Junio C HamanoMay 10, 2024
  29. 00/13 reftable: prepare for re-seekable iteratorsPatrick Steinhardt, May 13, 2024
  30. 01/13 reftable/block: use `size_t` to track restart point indexPatrick Steinhardt, May 13, 2024
  31. Karthik NayakMay 21, 2024
  32. Patrick SteinhardtMay 22, 2024
  33. 02/13 reftable/reader: avoid copying index iteratorPatrick Steinhardt, May 13, 2024
  34. 03/13 reftable/reader: unify indexed and linear seekingPatrick Steinhardt, May 13, 2024
  35. Karthik NayakMay 21, 2024
  36. Patrick SteinhardtMay 22, 2024
  37. Karthik NayakMay 22, 2024
  38. 04/13 reftable/reader: separate concerns of table iter and reftable readerPatrick Steinhardt, May 13, 2024
  39. 05/13 reftable/reader: inline `reader_seek_internal()`Patrick Steinhardt, May 13, 2024
  40. 06/13 reftable/reader: set up the reader when initializing table iteratorPatrick Steinhardt, May 13, 2024
  41. 07/13 reftable/merged: split up initialization and seeking of recordsPatrick Steinhardt, May 13, 2024
  42. 08/13 reftable/merged: simplify indices for subiteratorsPatrick Steinhardt, May 13, 2024
  43. 09/13 reftable/generic: move seeking of records into the iteratorPatrick Steinhardt, May 13, 2024
  44. 10/13 reftable/generic: adapt interface to allow reuse of iteratorsPatrick Steinhardt, May 13, 2024
  45. 11/13 reftable/reader: adapt interface to allow reuse of iteratorsPatrick Steinhardt, May 13, 2024
  46. 12/13 reftable/stack: provide convenience functions to create iteratorsPatrick Steinhardt, May 13, 2024
  47. 13/13 reftable/merged: adapt interface to allow reuse of iteratorsPatrick Steinhardt, May 13, 2024
  48. Justin ToblerMay 15, 2024
  49. Karthik NayakMay 21, 2024
  50. Patrick SteinhardtMay 22, 2024

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