Generate Random Table data for a given query

[tanvi2410]

Summary

This PR introduces a new test data generation system that creates realistic test data by analyzing SQL predicates and inferring value constraints for table columns.

Key Features

• Predicate-Aware Data Generation: Analyzes SQL WHERE clauses to generate data that satisfies query constraints
• Domain Inference Integration: Uses DomainInferenceProgram to derive input domains from predicates (e.g., SUBSTRING(name, 1, 4) = '2000' generates names starting with "2000")
• DNF Conversion: Handles complex predicates by converting to Disjunctive Normal Form
• Random Fallback: Generates type-appropriate random data for unconstrained columns

Implementation Details

• Supports numeric types (INTEGER, BIGINT, FLOAT, DOUBLE)
• Supports string types (CHAR, VARCHAR) with regex domain constraints
• Supports temporal types (DATE, TIME, TIMESTAMP)
• Handles conjunctive predicates (AND) by intersecting domains
• Uses ThreadLocalRandom for efficient random value generation

Test

Added unit test with different SQL scenarios.

Test results

=== Test: Generate Test Data with LOWER Predicate ===
SQL: SELECT * FROM test.T WHERE LOWER(name) = 'john'

Generated Test Data:
Row 1: {name=JOHN, age=505, birthdate=2000-08-09}
Row 2: {name=JOHN, age=322, birthdate=2002-05-04}
Row 3: {name=JOHN, age=516, birthdate=2013-12-06}
=== Test Passed ===


=== Test: Generate Test Data with Multiple Predicates ===
SQL: SELECT * FROM test.T WHERE SUBSTRING(name, 1, 4) = '2000' AND age = 25

Generated Test Data:
Row 1: {name=2000, age=25, birthdate=2016-01-09}
Row 2: {name=2000, age=25, birthdate=2011-08-24}
Row 3: {name=2000, age=25, birthdate=2008-04-28}
=== Test Passed ===


=== Test: Generate Test Data with No Predicate ===
SQL: SELECT * FROM test.T

Generated Test Data:
Row 1: {name=yB3p6DY0nt, age=581, birthdate=2012-07-13}
Row 2: {name=PUaVJ0R50z, age=173, birthdate=2009-12-22}
Row 3: {name=1ei9EFv5lc, age=614, birthdate=2010-07-27}
Row 4: {name=zzYqA6nkiQ, age=545, birthdate=2016-06-21}
Row 5: {name=wux0RgM8Aa, age=35, birthdate=2023-07-06}
=== Test Passed ===


=== Test: Generate Test Data with SUBSTRING Predicate ===
SQL: SELECT * FROM test.T WHERE SUBSTRING(name, 1, 4) = '2000'

Generated Test Data:
Row 1: {name=2000, age=769, birthdate=2018-09-14}
Row 2: {name=2000, age=980, birthdate=2002-12-12}
Row 3: {name=2000, age=687, birthdate=2020-10-06}
Row 4: {name=2000, age=928, birthdate=2006-08-21}
Row 5: {name=2000, age=805, birthdate=2010-08-26}
=== Test Passed ===