Reduce memory usage during prefetches of JSON column in Wide parts#77640
Merged
Avogar merged 2 commits intoClickHouse:masterfrom Mar 17, 2025
Merged
Reduce memory usage during prefetches of JSON column in Wide parts#77640Avogar merged 2 commits intoClickHouse:masterfrom
Avogar merged 2 commits intoClickHouse:masterfrom
Conversation
Contributor
Member
Author
|
For example: clickhouse-cloud :) select * from test where y = 1 format Null settings max_parallel_replicas=1
0 rows in set. Elapsed: 8.283 sec. Processed 1.00 million rows, 8.12 MB (120.73 thousand rows/s., 979.72 KB/s.)
Peak memory usage: 69.16 GiB.Now: clickhouse-cloud :) select * from test where y = 1 format Null settings max_parallel_replicas=1
0 rows in set. Elapsed: 0.351 sec. Processed 1.00 million rows, 8.11 MB (2.85 million rows/s., 23.15 MB/s.)
Peak memory usage: 1.11 GiB. |
nickitat
reviewed
Mar 14, 2025
nickitat
approved these changes
Mar 14, 2025
Merged
via the queue into
ClickHouse:master
with commit Mar 17, 2025
635dcdc
120 of 123 checks passed
1 task
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
3 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Reduce memory usage during prefetches of JSON column in Wide parts
Documentation entry for user-facing changes