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Fix recalculation of skip indexes in ALTER UPDATE queries when table has adaptive granularity #55202

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merged 6 commits into from Oct 9, 2023

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canhld94
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@canhld94 canhld94 commented Oct 2, 2023

Changelog category (leave one):

  • Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

  • Fix recalculation of skip indexes in ALTER UPDATE queries when table has adaptive granularity

When table has adaptive granularity, ALTER UPDATE may change number of marks in compact parts.

Reproduce: https://fiddle.clickhouse.com/9f2b67f0-07ab-4d90-82fa-5f2c1abf7ee7

CREATE TABLE kv
(
    `key` UInt64,
    `value` UInt64,
    `s` String,
    INDEX value_idx value TYPE SET(0) GRANULARITY 1
)
ENGINE = ReplacingMergeTree
ORDER BY key
SETTINGS index_granularity = 32, index_granularity_bytes = 1024;

INSERT INTO kv SELECT
    number,
    number + 100,
    toString(number)
FROM numbers(2048);

ALTER TABLE kv
    UPDATE s = 'barzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzdgfasdghasldfasdfaghfweaufghdasgjasd;lfkaksvnasdljfhjd;alkfgjsdaghasdhgfaosdfhdasjh' WHERE 1
SETTINGS mutations_sync = 2;

SELECT *
FROM kv
WHERE value = 42;

Certainly close #53858, close #52652

Information about CI checks: https://clickhouse.com/docs/en/development/continuous-integration/

…granularity_bytes > 0

Signed-off-by: Duc Canh Le <duccanh.le@ahrefs.com>
Signed-off-by: Duc Canh Le <duccanh.le@ahrefs.com>
Signed-off-by: Duc Canh Le <duccanh.le@ahrefs.com>
@amosbird
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amosbird commented Oct 2, 2023

Why do we need to rebuild projections when the granularity of parent part change?

@canhld94
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canhld94 commented Oct 3, 2023

Why do we need to rebuild projections when the granularity of parent part change?

@amosbird I didn't thought much about projections when making this changes. It seem we don't need to rebuild projections in this case. I will push a fix.

Also cc @CurtizJ how do you think about this changes?

@canhld94
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canhld94 commented Oct 3, 2023

Yes, projections have no issue https://fiddle.clickhouse.com/379c0cc1-92de-47f2-a038-0aa90de07521

Signed-off-by: Duc Canh Le <duccanh.le@ahrefs.com>
@CurtizJ CurtizJ self-assigned this Oct 3, 2023
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It looks correct. But to be honest I already barely understand the code near recalculations of skip indexes and other dependencies. Probably we have to refactor it a bit in the future.

@CurtizJ CurtizJ added the can be tested Allows running workflows for external contributors label Oct 3, 2023
@robot-clickhouse-ci-2 robot-clickhouse-ci-2 added the pr-bugfix Pull request with bugfix, not backported by default label Oct 3, 2023
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robot-clickhouse-ci-2 commented Oct 3, 2023

This is an automated comment for commit bea4a4e with description of existing statuses. It's updated for the latest CI running

❌ Click here to open a full report in a separate page

Successful checks
Check nameDescriptionStatus
AST fuzzerRuns randomly generated queries to catch program errors. The build type is optionally given in parenthesis. If it fails, ask a maintainer for help✅ success
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ClickHouse build checkBuilds ClickHouse in various configurations for use in further steps. You have to fix the builds that fail. Build logs often has enough information to fix the error, but you might have to reproduce the failure locally. The cmake options can be found in the build log, grepping for cmake. Use these options and follow the general build process✅ success
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@amosbird
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amosbird commented Oct 3, 2023

Yes, projections have no issue

The title and change log entry also need update.

@canhld94 canhld94 changed the title Fix recalculation of skip indexes and projections in ALTER UPDATE queries when table has adaptive granularity Fix recalculation of skip indexes in ALTER UPDATE queries when table has adaptive granularity Oct 3, 2023
Signed-off-by: Duc Canh Le <duccanh.le@ahrefs.com>
@CurtizJ CurtizJ merged commit 26a938c into ClickHouse:master Oct 9, 2023
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