implement export partition all

[arthurpassos]

Changelog category (leave one):

• New feature

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

Introduce the export partition all command, which schedules exports for all partitions in a given table. Introduce a setting to control scheduling failure behavior

Documentation entry for user-facing changes

...

CI/CD Options

Exclude tests:

• Fast test
• Integration Tests
• Stateless tests
• Stateful tests
• Performance tests
• All with ASAN
• All with TSAN
• All with MSAN
• All with UBSAN
• All with Coverage
• All with Aarch64
• All Regression
• Disable CI Cache

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• S3 Export (2h)
• Swarms (30m)
• Tiered Storage (2h)

[github-actions]

Workflow [PR], commit [6971178]

[chatgpt-codex-connector]

💡 Codex Review

ClickHouse/tests/queries/0_stateless/03609_export_merge_tree_partition_all.sh

Line 32 in 0eb7a47

query "ALTER TABLE $rmt_table EXPORT PARTITION ALL TO TABLE $s3_table SETTINGS allow_experimental_export_merge_tree_part = 1"

Poll instead of sleeping for partition exports

This test relies on a fixed 15-second delay after EXPORT PARTITION ALL, but the ALTER only schedules asynchronous per-partition export tasks. On slower CI or object-storage backends the exports can legitimately take longer, so the following read from the S3 table can race and report missing rows even though the feature works. Poll system.replicated_partition_exports for the expected partition ids to reach COMPLETED before querying the destination, as the integration tests do.

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