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- Benchmark Suite 12851
- DuckDB has an extensive benchmark suite. When making changes that have potential performance implications, it is important to run these benchmarks to detect potential performance regressions. Getting Started To build the benchmark suite, ru
...1 BUILD_EXTENSIONS='tpch' make Listing Benchmarks To list all available benchmarks, run: build/release/benchmark/benchmark_runner --list Running Benchmarks Running a Single Benchmark To run a single benchmark, issue the following command: build/release.../benchmark/benchmark_runner benchmark/micro/nulls/no_nulls_addition.benchmark The output will be printed to stdout in CSV format, in the following for...g the --out flag. This will write only the timings (delimited by newlines) to that file. build/release/benchmark/benchmark_runner benchmark/micro/nulls/no_nulls_addition.benchmark --out=timings.out The output will contain the following: 0.182472 0.1850... - https://man.mtool.work/duckdb/2.0/dev/benchmark.html
- Result Verification 8512
- The standard way of verifying results of queries is using the query statement, followed by the letter I times the number of columns that are expected in the result. After the query, four dashes ( ---- ) are expected followed by the result v
...are also accepted to denote columns. Deprecated DuckDB deprecated the usage of types in the sqllogictest. The DuckDB test runner does not use or need them internally – therefore, only I should be used to denote columns. NULL Values and Empty Strings E...mpty lines have special significance for the SQLLogic test runner: they signify an end of the current statement or query. For that reason, empty strings and NULL values have special syntax... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/result_verification.html
- Unit Tester Configuration 8383
- There are three ways of setting options for the unit tester: Command Line Arguments Configuration File Environment Variables Configuration Options List See the Configuration Options List for the full list of available options. Command Line
...e Use $HOME/USERPROFILE instead of the sandboxed temp-dir home --max-test-threads <num> Max threads to be used by the test runner itself (for e.g. concurrent loop) --max-threads <num> Max threads to use during tests --on-cleanup <string> SQL statements...default on) --test-config <path> Path to a configuration file --test-dir <path> Override default working directory of test runner, available in tests as --test-env <list[struct]> The test variables, struct should have keys env_name and env_value --test... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/test_configuration.html
- ADBC Client 8089
- Installation To use the DuckDB ADBC client, download the libduckdb archive for your platform and follow the instructions below . For Python, install the duckdb package instead, as described in the Python section . The latest stable version
...arrow.PrimitiveTypes.Float64}}, nil) return array.NewRecord(schema, []arrow.Array{col}, int64(col.Len())) } type DuckDBSQLRunner struct { ctx context.Context conn adbc.Connection db adbc.Database } func NewDuckDBSQLRunner(ctx context.Context) (*DuckDB...SQLRunner, error) { var drv drivermgr.Driver db, err := drv.NewDatabase(map[string]string{ "driver": "duckdb", "entrypoint": "duckdb...!= nil { return nil, fmt.Errorf("failed to open connection to new in-memory DuckDB database: %w", err) } return &DuckDBSQLRunner{ctx: ctx, conn: conn, db: db}, nil } func serializeRecord(record arrow.Record) (io.Reader, error) { buf := new(bytes.Buffe... - https://man.mtool.work/duckdb/2.0/clients/adbc.html
- Merge Statement for SCD Type 2 8089
- This is a practical, step-by-step guide to using DuckDB's MERGE statement (introduced in v1.4.0) to perform upserts and build Slowly Changing Dimension Type 2 (SCD Type 2) tables . Type 2 SCDs let you keep full historical versions of record
..., NULL, true), (104, 'Splash', 'Muscovy', 'Pond C', CURRENT_DATE - INTERVAL '1 day', NULL, true), (105, 'Puddles', 'Indian Runner', 'Relocated', CURRENT_DATE - INTERVAL '1 day', NULL, true); Step 2: Create the Master (target) Table This table represent...s', 'Rouen', 'Pond B', CURRENT_DATE - INTERVAL '2 days', NULL, true), (nextval('duck_record_seq'), 105, 'Puddles', 'Indian Runner', 'Pond A', CURRENT_DATE - INTERVAL '2 days', NULL, true); Step 3: Perform the Merge Statement This statement will perform... - https://man.mtool.work/duckdb/2.0/guides/sql_features/merge.html
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