chore: Bump version to v1.67.0

- Update Cargo.toml version from 1.66.0 to 1.67.0
- Update CHANGELOG with v1.67.0 release date
- Create comprehensive RELEASE_NOTES for v1.67.0
- Highlight 86% window function performance improvement
- Ready for crates.io publication

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: TimelordUK

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to SQL CLI will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.67.0] - 2025-11-05
 
 ### Performance Improvements
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sql-cli"
-version = "1.66.0"
+version = "1.67.0"
 edition = "2021"
 autobins = false
 autoexamples = false

RELEASE_NOTES.md

@@ -1,64 +1,101 @@
-# SQL CLI v1.66.0
+# SQL CLI v1.67.0
 
-**Release Date:** November 02, 2025
+**Release Date:** November 05, 2025
 
-## 📊 Release Overview
-- **Commits in this release:** 12
-- **Files updated:** 42
-
-## ✨ Highlights
+## 🚀 Window Function Performance Revolution - 86% Faster!
 
-### 🔍 Enhanced Debugging
-- **Better Diagnostics**: Improved error messages and state dumps
+This release brings dramatic performance improvements to window functions through our new batch evaluation engine. Complex analytical queries now run up to **86% faster** on large datasets!
 
-## 📝 Changes by Category
-
-### 🚀 New Features
-- Add SELECT * EXCLUDE syntax support (DuckDB compatibility)
-- Add complete line geometry analysis toolkit
-- Add comprehensive vector mathematics support
-- Add ILIKE operator support (PostgreSQL compatibility)
+## 📊 Release Overview
+- **Major Performance Boost**: 86% improvement for window functions
+- **New Functions**: RANK and DENSE_RANK window functions
+- **Smart Optimization**: Automatic O(n) algorithms for cumulative patterns
+- **Zero Configuration**: All improvements enabled by default
 
-### 🐛 Bug Fixes
-- Fix test_examples.py capture for multi-statement JSON output
-- Remove REPLACE keyword to avoid conflict with REPLACE() function
+## ✨ Highlights
 
-### 📚 Documentation
-- Update roadmap to reflect completed features
-- Add temp table example to README showing multi-stage -q queries
+### 🎯 Blazing Fast Window Functions
+- **50,000 rows with LAG**: 2.24s → **350ms** (86% improvement!)
+- **Cumulative SUM**: Previously timing out → Now **338ms**
+- All window functions now use optimized batch evaluation by default
+
+### 📈 What's Optimized
+- ✅ Window aggregates: `SUM`, `AVG`, `MIN`, `MAX`, `COUNT`, `FIRST_VALUE`, `LAST_VALUE`
+- ✅ Positional functions: `LAG`, `LEAD`, `ROW_NUMBER`
+- ✅ Ranking functions: `RANK`, `DENSE_RANK` (newly implemented!)
+- ✅ Smart O(n) algorithms for cumulative patterns
+
+## 📝 Example Usage
+
+```sql
+-- This query is now 86% faster!
+SELECT 
+    sale_date,
+    amount,
+    SUM(amount) OVER (ORDER BY sale_date ROWS UNBOUNDED PRECEDING) as running_total,
+    AVG(amount) OVER (ORDER BY sale_date ROWS 30 PRECEDING) as moving_avg_30,
+    LAG(amount, 1) OVER (ORDER BY sale_date) as prev_amount,
+    RANK() OVER (ORDER BY amount DESC) as sales_rank
+FROM sales
+ORDER BY sale_date;
+```
+
+## 🔧 Technical Details
+
+### Performance Improvements
+- **Batch Evaluation**: Process all rows in a single pass instead of per-row evaluation
+- **Hash-Based Caching**: Pre-create and cache WindowContext objects (50,000 lookups → 1)
+- **Running Aggregates**: O(n) incremental calculation for UNBOUNDED PRECEDING frames
+- **Smart Detection**: Automatically optimizes cumulative and running total patterns
+
+### Configuration
+- Batch evaluation is **enabled by default** - no configuration needed!
+- To opt-out (not recommended): Set `SQL_CLI_BATCH_WINDOW=0`
+- Complex expressions automatically use the optimal evaluation strategy
+
+## 🐛 Bug Fixes
+- Fixed window aggregate functions (AVG) returning incorrect results in certain cases
+- Fixed Python test suite warnings about test functions returning values
+- Fixed expression evaluation for window functions embedded in calculations
+
+## 📋 Full Commit List
 
 <details>
-<summary>📋 View all commits</summary>
-
-- chore: Bump version to 1.66.0 and update CHANGELOG (TimelordUK)
-- fix: Fix test_examples.py capture for multi-statement JSON output (TimelordUK)
-- test: Add formal test for SELECT * EXCLUDE feature (TimelordUK)
-- feat: Add SELECT * EXCLUDE syntax support (DuckDB compatibility) (TimelordUK)
-- feat(sql): Add complete line geometry analysis toolkit (TimelordUK)
-- feat(sql): Add comprehensive vector mathematics support (TimelordUK)
-- ci: Add performance benchmarking to GitHub Actions workflow (TimelordUK)
-- fix: Remove REPLACE keyword to avoid conflict with REPLACE() function (TimelordUK)
-- chore: Add EXCLUDE and REPLACE tokens to lexer (TimelordUK)
-- feat: Add ILIKE operator support (PostgreSQL compatibility) (TimelordUK)
-- docs: Update roadmap to reflect completed features (TimelordUK)
-- docs: Add temp table example to README showing multi-stage -q queries (TimelordUK)
+<summary>View all commits</summary>
+
+- feat: Make batch window evaluation the default and fix expression handling
+- fix: Update Python tests to use assertions instead of return values
+- feat: Optimize window aggregates for UNBOUNDED PRECEDING frames
+- feat: Implement batch evaluation for window functions - 86% performance improvement!
+- feat: Window function optimization Phase 2 + Step 0 prep for batch evaluation
+- feat: Add Phase 1 window function profiling infrastructure
 
 </details>
 
 ## 🎯 Key Features
 
+- **Window Functions**: Now with 86% better performance!
 - **Instant Data Preview**: CSV/JSON files load immediately
-- **Visual Feedback**: Key press indicator, cell highlighting
-- **Advanced Navigation**: Vim-style keys, viewport/cursor lock
+- **Advanced SQL**: CTEs, subqueries, window functions, aggregates
 - **Powerful Search**: Regular search (Ctrl+F), fuzzy filter (Ctrl+/)
 - **Data Export**: Save as CSV or JSON
-- **Debug Mode**: Press F5 for comprehensive state information
+- **Vim Navigation**: Full vim-style key bindings
 
 ## 📦 Installation
 
-Download the binary for your platform from the assets below.
+```bash
+cargo install sql-cli
+```
+
+Or download the binary for your platform from the assets below.
+
+## 📈 Upgrade Recommendation
+
+**Highly recommended upgrade** for anyone using window functions, especially on large datasets. The performance improvements are substantial and all existing queries will automatically benefit.
 
 ---
+
 **Thank you for using SQL CLI!** 🎉
 
 Report issues: [GitHub Issues](https://github.com/TimelordUK/sql-cli/issues)
+Full changelog: [CHANGELOG.md](https://github.com/TimelordUK/sql-cli/blob/main/CHANGELOG.md)