Add comprehensive SQL benchmark suite for Databend

[Copilot]

Implements a production-ready benchmark suite with 41 SQL queries across 5 categories to test Databend performance on diverse workloads.

Benchmark Categories

• TPC-H (6 queries): Industry-standard decision support queries testing complex aggregations, multi-table joins, and subqueries
• ClickBench (8 queries): Analytical queries on web analytics schema with 100+ columns
• Basic CRUD (10 queries): INSERT/SELECT/UPDATE/DELETE operations, both single-row and bulk
• Aggregation & JOINs (9 queries): Complex analytical queries with GROUP BY, HAVING, INNER/LEFT JOIN on 100K+ rows
• Time-Series (6 queries): Time windowing, moving averages, LAG/LEAD window functions on 1M+ rows

Implementation Details

Each category includes:

• setup.sql - Creates schema and generates sample data using numbers() function (no external files)
• Query files (q1.sql, q2.sql, etc.) with inline documentation
• README.md with usage instructions and performance considerations

Automation

run_benchmark.sh provides:

• CLI configurability (--cli bendsql or databend-query)
• Execution modes: all benchmarks, specific category, setup-only, single query
• Cross-platform timing with nanosecond precision where supported
• CSV result tracking with query name and duration
• Environment variable overrides for host/port/user

Usage

# Run all benchmarks
./run_benchmark.sh --all

# Run specific category
./run_benchmark.sh --benchmark tpch

# Custom configuration
DATABEND_CLI=bendsql ./run_benchmark.sh --benchmark aggregation --host prod.databend.io

Results written to benchmark_results.csv for analysis.

Original prompt

databend benchmark sql scripts

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