Horton

Re: Table AM Interface Enhancements

Mark Dilger <mark.dilger@enterprisedb.com>

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From: Mark Dilger <mark.dilger@enterprisedb.com>
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2023-11-27T20:19:09Z
Lists: pgsql-hackers 

> On Nov 25, 2023, at 9:47 AM, Alexander Korotkov <aekorotkov@gmail.com> wrote:
> 
>> Should the patch at least document which parts of the EState are expected to be in which states, and which parts should be viewed as undefined?  If the implementors of table AMs rely on any/all aspects of EState, doesn't that prevent future changes to how that structure is used?
> 
> New tuple tuple_insert_with_arbiter() table AM API method needs EState
> argument to call executor functions: ExecCheckIndexConstraints(),
> ExecUpdateLockMode(), and ExecInsertIndexTuples().  I think we
> probably need to invent some opaque way to call this executor function
> without revealing EState to table AM.  Do you think this could work?

We're clearly not accessing all of the EState, just some specific fields, such as es_per_tuple_exprcontext.  I think you could at least refactor to pass the minimum amount of state information through the table AM API.

—
Mark Dilger
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. Remove extra comment at TableAmRoutine.scan_analyze_next_block

  2. revert: Generalize relation analyze in table AM interface

  3. Revert: Allow table AM to store complex data structures in rd_amcache

  4. Revert: Allow table AM tuple_insert() method to return the different slot

  5. Revert: Allow locking updated tuples in tuple_update() and tuple_delete()

  6. Revert: Let table AM insertion methods control index insertion

  7. Revert: Custom reloptions for table AM

  8. Provide a way block-level table AMs could re-use acquire_sample_rows()

  9. Custom reloptions for table AM

  10. Use streaming I/O in ANALYZE.

  11. Revert "Custom reloptions for table AM"

  12. Let table AM insertion methods control index insertion

  13. Generalize relation analyze in table AM interface

  14. Improve error message for tts_(virtual|minimal)_is_current_xact_tuple

  15. Add comments on some MinimalTupleSlots methods usage

  16. Add TupleTableSlotOps.is_current_xact_tuple() method

  17. Allow table AM tuple_insert() method to return the different slot

  18. Allow table AM to store complex data structures in rd_amcache