Set join_collapse_limit default value to the same as used in PostgreS…#360
Merged
Alena0704 merged 2 commits intoOPENGPDB_STABLEfrom Mar 11, 2026
Merged
Set join_collapse_limit default value to the same as used in PostgreS…#360Alena0704 merged 2 commits intoOPENGPDB_STABLEfrom
Alena0704 merged 2 commits intoOPENGPDB_STABLEfrom
Conversation
Contributor
Author
|
Нужно ли указать ссылку в коммит месседж на исходный патч apache/cloudberry#1525, где был фикс? |
Contributor
да, надо, чтобы было понятно, откуда взяты изменения |
Contributor
|
join_collapse_limit is 13 in Cloudberry. Why is 13 replaced with 8? |
Alena0704
force-pushed
the
fix_join_collapse_limit
branch
4 times, most recently
from
bbd5c8e to
4735ceb
Compare
The default value of join_collapse_limit was 20. When this value is set and the query contains about 20 joins (see added test), Postgres query optimizer cannot build a plan during hours and consumes a lot of memory, because the planner checks a lot of possible ways to join the tables. When join_collapse_limit is 13, the query plan is built in reasonable time. Cherry-picked from Apache Cloudberry: apache/cloudberry@b245e4d
Alena0704
force-pushed
the
fix_join_collapse_limit
branch
4 times, most recently
from
30b42ba to
9627d4f
Compare
Alena0704
force-pushed
the
fix_join_collapse_limit
branch
from
9627d4f to
ac1509d
Compare
Contributor
Author
|
I have added the second commit to fix 'distributed by' notices in bfv_joins test. |
andr-sokolov
approved these changes
Mar 11, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Uh oh!
There was an error while loading. Please reload this page.