Horton

Re: Eager aggregation, take 3

Tender Wang <tndrwang@gmail.com>

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From: Tender Wang <tndrwang@gmail.com>
To: Richard Guo <guofenglinux@gmail.com>
Cc: Paul George <p.a.george19@gmail.com>, Andy Fan <zhihuifan1213@163.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>, pgsql-hackers@lists.postgresql.org
Date: 2024-09-13T07:48:20Z
Lists: pgsql-hackers 
Tender Wang <tndrwang@gmail.com> 于2024年9月4日周三 11:48写道：

>
>
> Richard Guo <guofenglinux@gmail.com> 于2024年8月21日周三 15:11写道：
>
>> On Fri, Aug 16, 2024 at 4:14 PM Richard Guo <guofenglinux@gmail.com>
>> wrote:
>> > I had a self-review of this patchset and made some refactoring,
>> > especially to the function that creates the RelAggInfo structure for a
>> > given relation.  While there were no major changes, the code should
>> > now be simpler.
>>
>> I found a bug in v10 patchset: when we generate the GROUP BY clauses
>> for the partial aggregation that is pushed down to a non-aggregated
>> relation, we may produce a clause with a tleSortGroupRef that
>> duplicates one already present in the query's groupClause, which would
>> cause problems.
>>
>> Attached is the updated version of the patchset that fixes this bug
>> and includes further code refactoring.
>>
>
> The v11-0002 git am failed on HEAD(6c2b5edecc).
>
> tender@iZ2ze6la2dizi7df9q3xheZ:/workspace/postgres$ git am
> v11-0002-Implement-Eager-Aggregation.patch
> Applying: Implement Eager Aggregation
> error: patch failed: src/test/regress/parallel_schedule:119
> error: src/test/regress/parallel_schedule: patch does not apply
> Patch failed at 0001 Implement Eager Aggregation
> hint: Use 'git am --show-current-patch=diff' to see the failed patch
> When you have resolved this problem, run "git am --continue".
> If you prefer to skip this patch, run "git am --skip" instead.
> To restore the original branch and stop patching, run "git am --abort".
>
>
Since MERGE/SPLIT partition has been reverted, the tests  *partition_merge*
and  *partition_split*  should be removed
from parallel_schedule. After doing the above, the 0002 patch can be
applied.

-- 
Thanks,
Tender Wang

Commits

  1. Fix eager aggregation for semi/antijoin inner rels

  2. Cover additional errors and corner conditions in repack.c

  3. Fix volatile function evaluation in eager aggregation

  4. Fix collation handling for grouping keys in eager aggregation

  5. Rename apply_at to apply_agg_at for clarity

  6. Fix comment in eager_aggregate.sql

  7. Remove unnecessary include of "utils/fmgroids.h"

  8. Implement Eager Aggregation

  9. Allow negative aggtransspace to indicate unbounded state size

  10. Add macros for looping through a List without a ListCell.

  11. Account for the effect of lossy pages when costing bitmap scans.

  12. Fix a thinko in join_is_legal: when we decide we can implement a semijoin