Add fluss-codegen module for runtime code generation #2399
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This commit introduces a new fluss-codegen module that provides runtime code generation capabilities using Janino compiler. Core framework: - CodeGeneratorContext: Manages reusable code fragments and member variables - JavaCodeBuilder: Type-safe builder for constructing Java source code with support for modifiers, parameters, and various code constructs - CompileUtils: Compiles generated source code using Janino with caching - GeneratedClass: Wrapper for generated class with source and compiled class - CodeGenException: Exception for code generation failures Code generators: - EqualiserCodeGenerator: Generates RecordEqualiser implementations for comparing InternalRow instances, supporting all Fluss data types Key features: - Type-safe API with Modifier enum, PrimitiveType enum, and Param class - Comprehensive support for all Fluss data types including nested types - Field projection support for partial row comparison - Compiled class caching for performance - Janino dependency shaded to avoid classpath conflicts Testing: - Comprehensive unit tests for all components - Generated code snapshot tests for reviewer understanding - 297 test cases covering edge cases and error handling License: - Janino (BSD 3-Clause) license included in META-INF/licenses/
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This commit introduces a new fluss-codegen module that provides runtime code generation capabilities using Janino compiler.
Core framework:
Code generators:
Key features:
Testing:
License:
Purpose
Linked issue: close #2398 2398
Brief change log
Tests
API and Format
Documentation