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@ajitpratap0 ajitpratap0 released this 04 Sep 05:57
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v1.2.0
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🚀 GoSQLX v1.2.0 - Phase 2: Advanced SQL Features

📋 Major Release Overview

This release delivers Phase 2 of the GoSQLX roadmap, implementing comprehensive Common Table Expressions (CTE) and Set Operations support. GoSQLX now provides enterprise-grade SQL parsing with ~70% SQL-92 compliance while maintaining the high-performance, race-free architecture.

✨ Key Features Implemented

🔄 Common Table Expressions (CTEs)

  • ✅ Simple CTEs: WITH table_name AS (SELECT ...)
  • ✅ Recursive CTEs: WITH RECURSIVE table_name AS (...)
  • ✅ Multiple CTEs: Support for comma-separated CTE definitions
  • ✅ Column Specifications: WITH cte(col1, col2) AS (...)
  • ✅ CTE Integration: Full compatibility with all statement types

🔗 Set Operations

  • ✅ UNION: Standard set union with automatic deduplication
  • ✅ UNION ALL: Set union preserving duplicates
  • ✅ EXCEPT: Set difference (SQL standard, equivalent to MINUS)
  • ✅ INTERSECT: Set intersection
  • ✅ Left-Associative Parsing: A UNION B INTERSECT C = (A UNION B) INTERSECT C
  • ✅ Combined Operations: CTEs with set operations in the same query

📊 Performance Metrics

Metric Value Status
Sustained Throughput 946K+ ops/sec (30s) ✅ No Regression
Peak Throughput 1.25M+ ops/sec (concurrent) ✅ Enhanced
Token Processing 8M+ tokens/sec ✅ Maintained
Simple Query Latency <280ns ✅ Optimized
Complex Query Latency <1μs (CTE/Set Ops) ✅ New Capability
Memory Efficiency 60-80% reduction ✅ Preserved
Race Conditions 0 detected ✅ Thread-Safe

🏗️ Technical Implementation

New Parser Functions

  • parseWithStatement() - Complete WITH clause parsing with recursive support
  • parseSelectWithSetOperations() - Set operations parsing with proper precedence
  • parseCommonTableExpr() - Individual CTE parsing with column specifications
  • parseMainStatementAfterWith() - Post-CTE statement routing

Enhanced Test Coverage

  • pkg/sql/parser/cte_test.go - 4 comprehensive CTE test functions
  • pkg/sql/parser/set_operations_test.go - 5 comprehensive set operation tests
  • Coverage: Simple CTE, Recursive CTE, Multiple CTEs, Set Operations, Complex Combinations

🎯 SQL Standards Compliance

✅ SQL-92 Features Implemented

  • Common Table Expressions (WITH clause)
  • Recursive queries (WITH RECURSIVE)
  • Set operations (UNION, EXCEPT, INTERSECT)
  • Complex query compositions
  • Proper operator precedence

📈 Compliance Progress

  • Phase 1: ~40% SQL-92 compliance (Basic SELECT, JOINs)
  • Phase 2: ~70% SQL-92 compliance (CTEs, Set Operations) ⬅️ Current
  • Phase 3 Target: 90%+ compliance (Window Functions, Advanced Features)

🔧 Production Deployment

✅ Ready for Production

  • Enterprise Workloads: Handles complex SQL parsing at scale
  • High-Throughput Systems: 946K+ operations/second sustained
  • Mission-Critical Applications: Race-free, memory-safe operation
  • International Usage: Full Unicode SQL support maintained

🚀 Deployment Requirements

  • Go Version: Go 1.19+ (tested with Go 1.21+)
  • Memory: Object pools auto-scale, minimal configuration needed
  • Concurrency: Scales linearly, no artificial limits
  • Monitoring: Built-in metrics and memory leak detection

📋 Example Usage

Simple CTE

WITH sales_summary AS (
    SELECT region, SUM(amount) as total 
    FROM sales GROUP BY region
) 
SELECT region FROM sales_summary WHERE total > 1000

Recursive CTE

WITH RECURSIVE employee_tree AS (
    SELECT employee_id, manager_id, name FROM employees WHERE manager_id IS NULL
    UNION ALL
    SELECT e.employee_id, e.manager_id, e.name 
    FROM employees e JOIN employee_tree et ON e.manager_id = et.employee_id
) 
SELECT * FROM employee_tree

Set Operations

SELECT name FROM users UNION SELECT name FROM customers;
SELECT id FROM orders UNION ALL SELECT id FROM invoices;
SELECT product FROM inventory EXCEPT SELECT product FROM discontinued;
SELECT customer_id FROM orders INTERSECT SELECT customer_id FROM payments;

Combined CTE + Set Operations

WITH regional AS (SELECT region FROM sales) 
SELECT region FROM regional UNION SELECT region FROM returns;

🔄 Backward Compatibility

  • ✅ 100% Backward Compatible: All existing functionality preserved
  • ✅ API Stability: No breaking changes to public interfaces
  • ✅ Legacy Tests: All Phase 1 and prior tests continue passing
  • ✅ Performance: No degradation in existing query parsing

🔜 Next Steps (Phase 3 - Q1 2025)

Phase 2 lays the groundwork for Phase 3 advanced features:

  • Window Functions: OVER clauses, ranking functions
  • Advanced JOINs: LATERAL joins, multiple-column USING clauses
  • Subquery Enhancements: Correlated subqueries, EXISTS clauses
  • Data Modification: Enhanced INSERT/UPDATE/DELETE with CTEs
  • SQL-99 Compliance: Advanced analytical functions

📝 Full Changelog

Added

  • Complete Common Table Expression (CTE) parsing with recursive support
  • Set operations: UNION, UNION ALL, EXCEPT, INTERSECT with proper precedence
  • Multiple CTE definitions in single query
  • CTE column specifications
  • Integration of CTEs with set operations
  • Comprehensive test coverage for all new features
  • Enhanced Go package documentation with Phase 2 examples

Changed

  • Enhanced parser statement routing to support set operations
  • Improved WITH clause attachment for complex statement types
  • Updated performance metrics and benchmarks

Performance

  • Maintains 946K+ sustained operations per second
  • Zero performance regression from Phase 1
  • Memory-efficient object pooling preserved
  • Race-free concurrent access validated

🎉 GoSQLX v1.2.0 delivers enterprise-grade SQL parsing with advanced CTE and set operations support!

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