Preliminary support for window functions

[komu]

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[Copilot]

Pull Request Overview

This PR introduces preliminary support for window functions in the Kriteria query DSL library. The implementation allows defining window specifications with partition and ordering clauses, and provides common aggregate functions like sum and avg that can operate over these windows.

Key changes:

• Added KrWindow and KrWindowBuilder classes for defining window specifications with partition and order clauses
• Extended expression system to support window-based aggregate function calls through CallAggregateExpression
• Integrated window translation into the JPA translation layer with Hibernate-specific support

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Sale.kt	New test entity representing sales data with employee, amount, and date fields
WindowFunctionsTest.kt	Comprehensive integration test demonstrating window function usage with partitioning and aggregation
KrWindow.kt	Core window specification classes with builder pattern for configuration
CommonWindowFunctions.kt	Convenience functions for common window aggregates (sum, avg)
KrExpression.kt	Enhanced expression hierarchy to support window-based function calls and improved formatting
ExpFunction.kt	Added window-specific aggregate function call methods
TranslateWindow.kt	Translation logic for converting KrWindow to Hibernate's JpaWindow
TranslationContext.kt	Added Hibernate-specific helper for operations requiring HibernateCriteriaBuilder
KrQueryOrSubqueryBuilder.kt	Added window() method for creating windows in query builders
TranslateExpression.kt	Enhanced expression translation to handle window-based aggregate calls
KrQuery.kt, KrSubquery.kt	Extended query structures to include window definitions
TranslateQueries.kt	Integrated window translation into query processing
PathCache.kt	Added placeholder for window caching (not yet implemented)

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