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CRITICAL_ISSUES_STATUS.md

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Critical Issues Status Report

🔍 MANUAL TEST FINDINGS ANALYSIS

Issue 1: UPDATE Crash ⚠️

Status: PARTIALLY FIXED

  • Fix Applied: Simplified UPDATE implementation to call actual update_record function
  • Current Status: Not tested yet (skipped per request)
  • Next Step: Test UPDATE functionality

Issue 2: SELECT Column List ❌

Status: NOT WORKING

  • Problem: SELECT with column list returns all columns instead of projected columns
  • Evidence: select id from employees returns all 3 columns (id, name, dept)
  • Root Cause: Column projection logic not being triggered properly
  • Current Behavior: Always returns SELECT * results regardless of column specification

Issue 3: Data Recovery ⚠️

Status: PARTIALLY WORKING

  • Data Recovery: ✅ WORKING - WAL recovery applied 2 INSERT operations correctly
  • Table Metadata: ❌ NOT WORKING - Table schema not recovered after restart
  • Evidence: Data exists in pages but "Table does not exist" error
  • Root Cause: System catalog not being restored from WAL/disk

📊 DETAILED ANALYSIS

SELECT Column List Issue

-- Expected: Only id column
select id from employees
-- Actual Result: All columns (id, name, dept)
id        name      dept         
---------------------------------
1         Alice     Engineering  
2         Bob       Marketing

Problem: The column projection logic in execute_select() is not working correctly.

Data Recovery Issue

REDO recovery completed: 2 operations applied  ✅
Table does not exist                           ❌

Problem: Data is recovered but table metadata (schema) is lost.

🛠️ FIXES NEEDED

1. Fix SELECT Column Projection

  • Column parsing is working (extracts column names correctly)
  • Column projection logic needs debugging
  • Issue likely in execute_select() function

2. Fix Table Metadata Recovery

  • WAL recovery restores data pages correctly
  • System catalog (table definitions) not being restored
  • Need to ensure table schema persistence and recovery

3. Test UPDATE Functionality

  • UPDATE implementation was simplified
  • Needs testing to confirm crash is fixed

🎯 PRIORITY ORDER

  1. HIGH: Fix SELECT column projection (affects basic SQL functionality)
  2. CRITICAL: Fix table metadata recovery (affects data persistence)
  3. MEDIUM: Test and verify UPDATE crash fix

📋 CURRENT WORKING FEATURES

✅ CREATE TABLE: Working correctly ✅ INSERT: Working with WAL logging ✅ **SELECT ***: Working correctly ✅ WHERE clauses: Working for filtering ✅ Data recovery: WAL REDO operations applied correctly ✅ Server stability: No crashes during testing

❌ SELECT column list: Returns all columns instead of projected columns ❌ Table metadata recovery: Schema not restored after restart ⚠️ UPDATE: Fix applied but not tested yet

Two critical issues remain that need immediate attention for full database functionality.