Create optimization GroupByDistinct, L2Distance and IfLowCardinality in processing.

[VKlin357]

Changelog category (leave one):

• Performance Improvement

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

todo

[CLAassistant]

All committers have signed the CLA.

[robot-clickhouse-ci-2]

This is an automated comment for commit 8d2d177f04f7b0ad3c24f259bb0f1e12fda6eced with description of existing statuses. It's updated for the latest CI running

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Check name	Description	Status
CI running	A meta-check that indicates the running CI. Normally, it's in success or pending state. The failed status indicates some problems with the PR	⏳ pending
ClickHouse build check	Builds 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	⏳ pending
Mergeable Check	Checks if all other necessary checks are successful	❌ failure
Style check	Runs a set of checks to keep the code style clean. If some of tests failed, see the related log from the report	❌ failure

Successful checks

Check name	Description	Status
Docs check	Builds and tests the documentation	✅ success
PR Check	There's no description for the check yet, please add it to tests/ci/ci_config.py:CHECK_DESCRIPTIONS	✅ success

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'

[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: Changelog entry required for category 'Performance Improvement'