docs: add Join Order Benchmark (JOB) example dataset page

[ayakovlev-clickhouse]

Summary

Add a new example dataset page documenting the Join Order Benchmark (JOB), a snapshot of IMDb used to stress-test query optimizers. Covers schema creation, loading the 21 tables from the public S3 Parquet files (loop and
explicit INSERT variants), per-table row/compressed-size figures, preparing the data from the original CSV files, and links to the init script, queries, and settings in the ClickHouse repository.

This is similar to page https://clickhouse.com/docs/getting-started/example-datasets/tpch

Checklist

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Note

Low Risk
Documentation-only changes with no runtime or product code impact.

Overview
Adds a new Getting Started → example datasets guide for the Join Order Benchmark (JOB) (IMDb snapshot used to stress join ordering and cardinality estimation).

The page documents creating the job database from init_cloud.sql, loading all 21 tables from public S3 Parquet (shell loop or per-table INSERT), a per-table row/compressed-size table, where to find the 113 benchmark queries and settings.json, and an optional path to rebuild from original PostgreSQL-style CSVs via convert_csv.py and init.sql with data_type_default_nullable=1.

Also adds Join Order Benchmark to the Vale Headings.yml capitalization exceptions so headings on the new page pass style checks.

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Project	Deployment	Actions	Updated (UTC)
clickhouse-docs	Ready	Preview, Comment	Jun 19, 2026 4:41pm

4 Skipped Deployments

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[ayakovlev-clickhouse]

Note that links to GH Core repo like tests/benchmarks/job/init.sql might not work yet. There is another PR to Core for this, see ClickHouse/ClickHouse#107756.
This PR should be merged only after those links are working.

[dhtclk]

@ayakovlev-clickhouse - I made a small commit to add the header to our exceptions list so the CI passes because it's flagged for sentence casing.

[dhtclk]

LGTM, left a few very minor non-blocking comments.