greptimedb/tests/cases/standalone/common/sample/basic_sample.sql

-- Migrated from DuckDB test: test/sql/sample/same_seed_same_sample.test
-- FIXME: the results are wrong in this test, waits for https://github.com/apache/datafusion/pull/16325
-- Test basic SAMPLE functionality

-- Create test table
CREATE TABLE test(x INTEGER, ts TIMESTAMP TIME INDEX);

-- Insert test data
INSERT INTO test SELECT number, number * 1000 FROM numbers limit 10000;

-- Test TABLESAMPLE with percentage
SELECT COUNT(*) > 0 FROM test TABLESAMPLE (10 PERCENT);

-- Test TABLESAMPLE with row count
SELECT COUNT(*) FROM test TABLESAMPLE (100 ROWS);

-- Test TABLESAMPLE SYSTEM
SELECT COUNT(*) > 0 FROM test TABLESAMPLE SYSTEM (25 PERCENT);

-- Test TABLESAMPLE BERNOULLI
SELECT COUNT(*) > 0 FROM test TABLESAMPLE BERNOULLI (25 PERCENT);

-- Test with REPEATABLE for consistent results
SELECT COUNT(*) AS cnt1 FROM test TABLESAMPLE SYSTEM (10 PERCENT) REPEATABLE (42);

SELECT COUNT(*) AS cnt2 FROM test TABLESAMPLE SYSTEM (10 PERCENT) REPEATABLE (42);

-- Test sampling with WHERE clause
SELECT COUNT(*) FROM test TABLESAMPLE (10 PERCENT) WHERE x > 5000;

-- Test sampling with ORDER BY
SELECT x FROM test TABLESAMPLE (5 ROWS) ORDER BY x LIMIT 5;

-- cleanup
DROP TABLE test;