Adding Window Functions and Enhancing Aggregation Features

[vistart]

Overview

This PR enhances our query capabilities by implementing window functions, advanced grouping models (CUBE, ROLLUP, and GROUPING SETS), and improving JSON test support. It also includes several refactoring changes to improve code clarity and consistency.

Changes

New Features

• Added comprehensive support for window functions with frame specifications
• Implemented test cases for both bounded and unbounded window frames
• Added utility functions for JSON test fixtures
• Implemented advanced grouping models (CUBE, ROLLUP, and GROUPING SETS)

Refactoring

• Renamed simple aggregate methods to "scalar" for better clarity
• Simplified window function definitions by removing unnecessary identifier formatting
• Standardized order direction in window function implementations
• Translated model and test docstrings to English for consistency
• Enhanced group column selection by checking for existing expressions
• Renamed test_json_expressions.py and updated import paths
• Replaced query.all() with query.aggregate() for JSON tests

Testing

• Added comprehensive test coverage for all new features
• Updated database configurations for more robust testing

Motivation

These changes provide more powerful querying capabilities while making the codebase more maintainable and consistent. The window functions allow for complex analytical queries, while the advanced grouping models enable more sophisticated data aggregation scenarios.

Impact

This PR significantly enhances our data analysis capabilities without breaking existing functionality. The refactoring changes improve code readability and maintainability while ensuring consistent naming and documentation across the codebase.

[sonarqubecloud]

Quality Gate failed

Failed conditions
4.0% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

Attention: Patch coverage is 67.51701% with 191 lines in your changes missing coverage. Please review.

Project coverage is 79.28%. Comparing base (eceb40c) to head (adbf0b2).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...social/activerecord/backend/impl/sqlite/dialect.py	29.24%	74 Missing and 1 partial ⚠️
src/rhosocial/activerecord/query/expression.py	74.83%	29 Missing and 9 partials ⚠️
src/rhosocial/activerecord/query/aggregate.py	77.86%	17 Missing and 10 partials ⚠️
src/rhosocial/activerecord/query/base.py	79.20%	14 Missing and 7 partials ⚠️
src/rhosocial/activerecord/backend/dialect.py	68.00%	16 Missing ⚠️
...social/activerecord/backend/impl/sqlite/backend.py	50.00%	12 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   79.56%   79.28%   -0.28%     
==========================================
  Files          41       41              
  Lines        3181     3708     +527     
  Branches      463      621     +158     
==========================================
+ Hits         2531     2940     +409     
- Misses        483      576      +93     
- Partials      167      192      +25     

Flag	Coverage Δ
python-3.10	78.91% <67.51%> (-0.53%)	⬇️
python-3.11	78.91% <67.51%> (-0.53%)	⬇️
python-3.12	78.91% <67.51%> (-0.53%)	⬇️
python-3.13	78.91% <67.51%> (-0.53%)	⬇️
python-3.8	79.16% <67.51%> (?)
python-3.9	78.97% <67.51%> (-0.55%)	⬇️
unittests	79.23% <67.51%> (-0.31%)	⬇️

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