Graphops/uint256 #2
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Implements 256-bit unsigned integer type using ethnum::u256 library. - Add UINT256 to protobuf data type enum - Implement ScalarImpl, ScalarRef, and ScalarRefImpl for UInt256 - Add UInt256Array implementation with arrow compatibility - Support serialization/deserialization in value encoding - Add hash key support for uint256 values - Include test utilities for generating random uint256 values - Extend type macros to support uint256 throughout the codebase This forms the foundation for uint256 support in RisingWave's type system.
- Map uint256 to Arrow Decimal256Array for data interchange - Add iceberg compatibility mapping for uint256 type - Support uint256 literals in frontend expression system - Extend data type utilities to handle uint256 - Add JSON conversion support for uint256 values - Update index selection rule to include uint256 type Enables efficient data exchange with external systems through Arrow format.
- BigQuery: map uint256 to BIGNUMERIC type - ClickHouse: use String representation for uint256 - Doris: encode as LARGEINT string representation - DynamoDB: serialize as string attribute - SQL Server: use VARCHAR(78) for uint256 values - StarRocks: encode as LARGEINT string - Add uint256 support in Avro, JSON, and Proto encoders - Include uint256 in Debezium JSON formatter - Extend MySQL and PostgreSQL parsers for uint256 compatibility Ensures uint256 values can be properly exported to various sink systems.
- Add binary arithmetic operators: +, -, *, /, % - Implement comparison operators: <, <=, >, >=, =, <> - Extend expression type macros to support uint256 - Add uint256 literal parsing in expression binder - Register uint256 in expression type system Enables arithmetic operations and comparisons on uint256 values in SQL queries.
- Implement casts from numeric types to uint256 - Add casts from uint256 to int256 and decimal - Support string to uint256 parsing - Update cast matrix with Implicit, Assign, and Explicit contexts - Handle overflow detection in numeric conversions Allows seamless type conversions between uint256 and other numeric types.
- Add sum aggregation for uint256 values - Implement min/max aggregates with proper state handling - Support statistical aggregates: avg, stddev_pop, stddev_samp, var_pop, var_samp - All statistical functions use float8 output type Enables aggregation operations on uint256 columns in streaming and batch queries.
- PostgreSQL: convert numeric types to uint256 with validation - JSON: parse uint256 from numeric and string representations - Add error handling for invalid uint256 conversions - Support list parsing for uint256 arrays Enables ingestion of uint256 values from PostgreSQL and JSON sources.
- Assign OID 1305 for rw_uint256 base type - Assign OID 1306 for _rw_uint256 array type - Register types in pg_type system catalog - Add proper I/O functions for PostgreSQL compatibility Enables PostgreSQL clients to properly recognize and handle uint256 types.
- Test DDL operations: CREATE TABLE, ALTER TABLE with uint256 - Verify DML operations: INSERT, UPDATE, DELETE - Test arithmetic operations and overflow behavior - Validate aggregate functions: sum, min, max, avg - Test type casting from numeric types and strings - Verify connector integration with PostgreSQL and JSON sources - Add boundary value tests for uint256 range Ensures uint256 type works correctly across all SQL operations.
- Document complete uint256 type implementation plan - Mark all three phases as complete with status indicators - List known limitations (hex literals, u512 accumulator, bitwise ops) - Include implementation details and file references - Specify PostgreSQL OID assignments (1305/1306) This specification serves as both design document and implementation guide for the uint256 feature in RisingWave.
- Add SQL usage examples for DDL, DML, and queries - Document connector integration patterns for PostgreSQL, JSON, and Avro - Provide sink configuration examples for major systems - Include common patterns like Wei to Ether conversion - Document limitations and performance considerations - Add best practices for handling overflow and external system integration The user guide provides practical examples for blockchain and DeFi use cases where uint256 is commonly needed.
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