Improve Stability and Achieve Zero-Warning Build#1
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📝 WalkthroughWalkthroughReplaces direct StorageManager usage with a BufferPoolManager and Page abstraction; adds LRUReplacer and RecoveryManager (ARIES-style stubs) with LogManager integration; rewires server/main, executor, transaction, and storage components to use the buffer pool; adds buffer-pool, recovery, and e2e tests and CI/formatting tweaks. Changes
Sequence Diagram(s)sequenceDiagram
participant App as Application (main)
participant DM as StorageManager (Disk)
participant BPM as BufferPoolManager
participant LM as LogManager
participant RM as RecoveryManager
participant TM as TransactionManager
participant Server as Server
participant Client as Client
App->>DM: create disk manager (files)
App->>LM: init LogManager(file)
App->>BPM: BufferPoolManager(pool_size, disk_manager, log_manager?)
App->>RM: RecoveryManager(bpm, catalog, log_manager)
RM->>LM: read logs (analyze / redo / undo)
RM->>BPM: fetch_page / write_page during recovery
App->>TM: TransactionManager(..., bpm)
App->>Server: Server::create(port, catalog, bpm)
Client->>Server: SQL requests
Server->>BPM: fetch_page / new_page / unpin_page
Server->>TM: acquire/release locks, coordinate transactions
BPM->>LM: flush WAL when writing dirty pages (if needed)
Estimated code review effort🎯 5 (Critical) | ⏱️ ~120 minutes Poem
🚥 Pre-merge checks | ✅ 2 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 5
♻️ Duplicate comments (1)
src/storage/btree_index.cpp (1)
131-133: Duplicate: verify index drop really deletes the file.
drop()now callsbpm_.close_file(...). Please ensure this actually removes the index file; otherwise, stale files may remain on disk. (Same concern as heap table drop.)🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/storage/btree_index.cpp` around lines 131 - 133, BTreeIndex::drop currently just calls bpm_.close_file(filename_), which may not remove the on-disk index; modify BTreeIndex::drop to ensure the underlying file is actually deleted: check whether bpm_ exposes a delete/remove API (e.g., bpm_.delete_file or bpm_.remove_file) and call that after closing, or if not, use std::filesystem::remove(filename_) to unlink the file; ensure you check and return the combined success (close + delete) and log or propagate errors so callers can detect a failed physical deletion.
🧹 Nitpick comments (1)
src/network/server.cpp (1)
332-363: Consider gating or removing debug prints in production path.The connection-level
std::couttraces can spam logs and slow tests; a logger or debug flag would keep noise down.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/network/server.cpp` around lines 332 - 363, The code in the connection-handling block spams std::cout (e.g., the prints around recv, "Handling new connection", "recv1/recv2 got ...", and "Failed to read rest of packet") which should be gated or replaced with a proper logger/debug flag; update the connection path to use the project logging facility (or wrap these prints behind a verbose/debug boolean) so normal production/tests don't emit these messages, keeping behavior of functions like ProtocolReader::read_int32, executor::QueryExecutor construction, and client_fd/recv error handling unchanged.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/network/server.cpp`:
- Around line 152-160: Run clang-format on src/network/server.cpp to fix
formatting issues reported by CI; reformat the file (including the block
containing the bind(...) and listen(...) calls and surrounding code) so it
complies with the project's clang-format configuration, then stage the updated
file and push the change; ensure the functions and symbols like bind, listen,
and the surrounding socket handling code are still logically unchanged after
formatting.
- Around line 233-251: Server::wait currently checks accept_thread_.joinable()
under thread_mutex_ then calls accept_thread_.join(), which races with stop()
that might join or move the thread; to fix, under the scoped lock move
accept_thread_ into a local std::thread variable (e.g., local_thread =
std::move(accept_thread_)) and clear should_join there, then release the lock
and call local_thread.join() if local_thread.joinable(); this avoids double-join
on accept_thread_ while preserving synchronization with thread_mutex_ and
stop().
In `@src/storage/heap_table.cpp`:
- Around line 109-115: The file src/storage/heap_table.cpp has clang-format
style violations; run clang-format over the file (or your repo's format command)
and commit the formatted changes so spacing/indentation around the buffer
declaration, while loop, read_page(page_num, buffer.data()),
std::memset(buffer.data(), 0, Page::PAGE_SIZE) and PageHeader header{} are
fixed; ensure the formatting follows the project's clang-format rules and that
no other style changes are left uncommitted.
- Around line 422-424: HeapTable::drop currently only calls
bpm_.close_file(filename_) which closes the buffer/file tracking but does not
remove the heap file from disk; change drop() to first ensure the file is closed
via bpm_.close_file(filename_) (if not already), then delete the physical file
using a file-removal API such as std::filesystem::remove(filename_) (or
std::remove) and return success based on the deletion result, handling and
logging any failure; update references to filename_ and bpm_.close_file
accordingly and ensure any exceptions from std::filesystem::remove are caught or
translated into a boolean return.
In `@tests/cloudSQL_tests.cpp`:
- Around line 268-269: Several BufferPoolManager initialization lines are
mis-indented causing clang-format failures; for each block that creates a
StorageManager followed by a BufferPoolManager (e.g., the occurrences that
create StorageManager("./test_data") and BufferPoolManager sm(128,
disk_manager)), fix the indentation to match the surrounding block style or run
clang-format across tests/cloudSQL_tests.cpp so the BufferPoolManager lines are
indented consistently with the StorageManager lines; ensure you update all
listed occurrences (around the StorageManager/BufferPoolManager pairs at the
comment: 275-276, 288-289, 313-314, 327-328, 348-349, 389-390, 434-435, 465-466,
488-489, 518-519, 543-544, 569-570, 597-598, 624-625, 661-662, 704-705, 742-743,
801-802) so clang-format CI passes.
---
Duplicate comments:
In `@src/storage/btree_index.cpp`:
- Around line 131-133: BTreeIndex::drop currently just calls
bpm_.close_file(filename_), which may not remove the on-disk index; modify
BTreeIndex::drop to ensure the underlying file is actually deleted: check
whether bpm_ exposes a delete/remove API (e.g., bpm_.delete_file or
bpm_.remove_file) and call that after closing, or if not, use
std::filesystem::remove(filename_) to unlink the file; ensure you check and
return the combined success (close + delete) and log or propagate errors so
callers can detect a failed physical deletion.
---
Nitpick comments:
In `@src/network/server.cpp`:
- Around line 332-363: The code in the connection-handling block spams std::cout
(e.g., the prints around recv, "Handling new connection", "recv1/recv2 got ...",
and "Failed to read rest of packet") which should be gated or replaced with a
proper logger/debug flag; update the connection path to use the project logging
facility (or wrap these prints behind a verbose/debug boolean) so normal
production/tests don't emit these messages, keeping behavior of functions like
ProtocolReader::read_int32, executor::QueryExecutor construction, and
client_fd/recv error handling unchanged.
ℹ️ Review info
Configuration used: defaults
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (16)
CMakeLists.txtinclude/executor/query_executor.hppinclude/network/server.hppinclude/storage/btree_index.hppinclude/storage/heap_table.hppinclude/transaction/transaction_manager.hppsrc/executor/operator.cppsrc/executor/query_executor.cppsrc/main.cppsrc/network/server.cppsrc/storage/btree_index.cppsrc/storage/heap_table.cppsrc/transaction/transaction_manager.cpptests/cloudSQL_tests.cpptests/server_tests.cpptests/transaction_manager_tests.cpp
| void Server::wait() { | ||
| const std::scoped_lock<std::mutex> lock(thread_mutex_); | ||
| if (accept_thread_.joinable()) { | ||
| std::thread::id accept_id; | ||
| bool should_join = false; | ||
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||
| { | ||
| const std::scoped_lock<std::mutex> lock(thread_mutex_); | ||
| if (accept_thread_.joinable()) { | ||
| accept_id = accept_thread_.get_id(); | ||
| should_join = true; | ||
| } | ||
| } | ||
|
|
||
| if (should_join) { | ||
| // Warning: This could be dangerous if stop() changes accept_thread_ concurrently, | ||
| // but typically only one thread will join anyway. | ||
| // A safer way is to just do it directly. | ||
| // Let's just avoid holding the mutex during join(). | ||
| accept_thread_.join(); | ||
| } |
There was a problem hiding this comment.
Fix possible double-join race in wait().
wait() can observe joinable() under lock, then stop() joins concurrently, making the subsequent join throw. Move the thread out under lock and join the local copy.
✅ Suggested fix
void Server::wait() {
- std::thread::id accept_id;
- bool should_join = false;
-
- {
- const std::scoped_lock<std::mutex> lock(thread_mutex_);
- if (accept_thread_.joinable()) {
- accept_id = accept_thread_.get_id();
- should_join = true;
- }
- }
-
- if (should_join) {
- // Warning: This could be dangerous if stop() changes accept_thread_ concurrently,
- // but typically only one thread will join anyway.
- // A safer way is to just do it directly.
- // Let's just avoid holding the mutex during join().
- accept_thread_.join();
- }
+ std::thread accept_thread;
+ {
+ const std::scoped_lock<std::mutex> lock(thread_mutex_);
+ accept_thread = std::move(accept_thread_);
+ }
+ if (accept_thread.joinable()) {
+ accept_thread.join();
+ }
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| void Server::wait() { | |
| const std::scoped_lock<std::mutex> lock(thread_mutex_); | |
| if (accept_thread_.joinable()) { | |
| std::thread::id accept_id; | |
| bool should_join = false; | |
| { | |
| const std::scoped_lock<std::mutex> lock(thread_mutex_); | |
| if (accept_thread_.joinable()) { | |
| accept_id = accept_thread_.get_id(); | |
| should_join = true; | |
| } | |
| } | |
| if (should_join) { | |
| // Warning: This could be dangerous if stop() changes accept_thread_ concurrently, | |
| // but typically only one thread will join anyway. | |
| // A safer way is to just do it directly. | |
| // Let's just avoid holding the mutex during join(). | |
| accept_thread_.join(); | |
| } | |
| void Server::wait() { | |
| std::thread accept_thread; | |
| { | |
| const std::scoped_lock<std::mutex> lock(thread_mutex_); | |
| accept_thread = std::move(accept_thread_); | |
| } | |
| if (accept_thread.joinable()) { | |
| accept_thread.join(); | |
| } | |
| } |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/network/server.cpp` around lines 233 - 251, Server::wait currently checks
accept_thread_.joinable() under thread_mutex_ then calls accept_thread_.join(),
which races with stop() that might join or move the thread; to fix, under the
scoped lock move accept_thread_ into a local std::thread variable (e.g.,
local_thread = std::move(accept_thread_)) and clear should_join there, then
release the lock and call local_thread.join() if local_thread.joinable(); this
avoids double-join on accept_thread_ while preserving synchronization with
thread_mutex_ and stop().
| bool HeapTable::drop() { | ||
| return storage_manager_.close_file(filename_); | ||
| return bpm_.close_file(filename_); | ||
| } |
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Switch drop() to actually delete the file, not just close it.
StorageManager::close_file() only closes the file handle and removes it from the internal tracking map—it does not delete the file from disk. The heap file will persist and can reappear on the next open(). Replace the call with a file deletion API (e.g., std::filesystem::remove() or std::remove()).
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/storage/heap_table.cpp` around lines 422 - 424, HeapTable::drop currently
only calls bpm_.close_file(filename_) which closes the buffer/file tracking but
does not remove the heap file from disk; change drop() to first ensure the file
is closed via bpm_.close_file(filename_) (if not already), then delete the
physical file using a file-removal API such as
std::filesystem::remove(filename_) (or std::remove) and return success based on
the deletion result, handling and logging any failure; update references to
filename_ and bpm_.close_file accordingly and ensure any exceptions from
std::filesystem::remove are caught or translated into a boolean return.
There was a problem hiding this comment.
Actionable comments posted: 1
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
tests/server_tests.cpp (1)
329-330:⚠️ Potential issue | 🟡 MinorMisleading "All tests passed" message when failures occur.
Line 330 unconditionally prints "All tests passed" before the failure check on line 331. When
tests_failed > 0, this message is incorrect.Suggested fix
std::cout << "========================\n"; - std::cout << "All tests passed: " << tests_passed << "\n"; - if (tests_failed > 0) { - std::cout << "Tests failed: " << tests_failed << "\n"; - return 1; - } - return 0; + std::cout << "Results: " << tests_passed << " passed, " << tests_failed << " failed\n"; + return (tests_failed > 0) ? 1 : 0;🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@tests/server_tests.cpp` around lines 329 - 330, The current code always prints "All tests passed: " with tests_passed even when failures exist; update the printing logic in tests/server_tests.cpp so that you check the tests_failed variable before printing — if tests_failed == 0 print "All tests passed: " with tests_passed, otherwise print a summary showing both tests_passed and tests_failed (or a clear failure message). Locate the output around the variables tests_passed and tests_failed where std::cout is used and adjust the conditional to ensure the "All tests passed" message is emitted only when tests_failed == 0.
♻️ Duplicate comments (1)
src/network/server.cpp (1)
233-238:⚠️ Potential issue | 🔴 CriticalDeadlock:
wait()joinsaccept_thread_while holdingthread_mutex_.
accept_connections()(line 303) acquiresthread_mutex_on every accepted connection. Ifwait()holdsthread_mutex_and blocks onaccept_thread_.join(), the accept loop will deadlock trying to re-acquire the same mutex. The past review's suggested fix (move the thread out under lock, join outside) also resolves this.Proposed fix
void Server::wait() { - const std::scoped_lock<std::mutex> lock(thread_mutex_); - if (accept_thread_.joinable()) { - accept_thread_.join(); + std::thread local_thread; + { + const std::scoped_lock<std::mutex> lock(thread_mutex_); + local_thread = std::move(accept_thread_); + } + if (local_thread.joinable()) { + local_thread.join(); } }🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/network/server.cpp` around lines 233 - 238, Server::wait() currently holds thread_mutex_ while calling accept_thread_.join(), causing a deadlock with accept_connections() which also locks thread_mutex_; fix by only holding the lock to transfer/move accept_thread_ out of the member, then release the lock and call join on the moved local thread. Concretely, in Server::wait() acquire the mutex, std::move accept_thread_ into a local std::thread (or swap), let the lock go out of scope, then if the local thread.joinable() call join(); this uses the existing accept_thread_ and thread_mutex_ symbols and avoids joining while holding the mutex.
🧹 Nitpick comments (3)
include/storage/page.hpp (2)
24-24: Redundantreset_memory()call —data_is already value-initialized.Line 61 declares
data_with{}which zero-initializes the array. The constructor then callsreset_memory()which fills with zero again. One of these is redundant.Also applies to: 59-59
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@include/storage/page.hpp` at line 24, The Page() constructor redundantly calls reset_memory() even though the member array data_ is value-initialized with {}; remove the extra initialization by deleting the reset_memory() call from the Page() constructor (leave data_ declared with {}), or alternatively remove the {} and keep reset_memory()—choose one consistent approach; update the Page() constructor (symbol: Page()) and the member declaration (symbol: data_) so initialization happens only once.
41-41:get_file_name()returnsstd::stringby value — preferconst std::string&.This accessor is likely called frequently (e.g., during page lookups/eviction). Returning by const reference avoids unnecessary heap allocations.
Suggested fix
- [[nodiscard]] std::string get_file_name() const { return file_name_; } + [[nodiscard]] const std::string& get_file_name() const { return file_name_; }🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@include/storage/page.hpp` at line 41, The accessor get_file_name() currently returns std::string by value causing allocations; change its signature to return a const std::string& (e.g., [[nodiscard]] const std::string& get_file_name() const) so callers receive a reference to the member file_name_ without copying, and keep the function const and nodiscard attributes; ensure file_name_ remains a std::string data member so the returned reference is valid for the object's lifetime.tests/cloudSQL_tests.cpp (1)
361-444: Network tests are disabled with#if 0.These tests (
NetworkTest_Handshake,NetworkTest_MultiClient) are compiled out. If they were migrated totests/server_tests.cpp, this dead code should be removed rather than left behind.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@tests/cloudSQL_tests.cpp` around lines 361 - 444, The two disabled tests enclosed by the `#if` 0/#endif block (NetworkTest_Handshake and NetworkTest_MultiClient) are dead code and should be removed; delete the entire `#if` 0 ... `#endif` block that contains these tests, and if their active equivalents were migrated (e.g., to server tests), ensure there are no duplicate test definitions by verifying NetworkTest_Handshake and NetworkTest_MultiClient exist only in the intended test file and not left behind as commented-out code; remove the `#if` 0/#endif markers and the enclosed test functions to clean up the codebase.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@include/storage/page.hpp`:
- Around line 49-54: The Page currently keeps LSN in lsn_ separate from data_,
so update the flush/read paths to persist the LSN: before
BufferPoolManager::flush_page() calls StorageManager::write_page(), serialize
get_lsn() into the agreed bytes at the start of the Page::data_ buffer (e.g.,
first 4 bytes) so the on-disk page contains the LSN, and likewise when pages are
read back from StorageManager::read_page() deserialize those bytes into
Page::set_lsn(); modify BufferPoolManager::flush_page() and the page load path
to perform this packing/unpacking, ensuring get_lsn()/set_lsn() remain
authoritative and consistent with data_ prior to any disk I/O.
---
Outside diff comments:
In `@tests/server_tests.cpp`:
- Around line 329-330: The current code always prints "All tests passed: " with
tests_passed even when failures exist; update the printing logic in
tests/server_tests.cpp so that you check the tests_failed variable before
printing — if tests_failed == 0 print "All tests passed: " with tests_passed,
otherwise print a summary showing both tests_passed and tests_failed (or a clear
failure message). Locate the output around the variables tests_passed and
tests_failed where std::cout is used and adjust the conditional to ensure the
"All tests passed" message is emitted only when tests_failed == 0.
---
Duplicate comments:
In `@src/network/server.cpp`:
- Around line 233-238: Server::wait() currently holds thread_mutex_ while
calling accept_thread_.join(), causing a deadlock with accept_connections()
which also locks thread_mutex_; fix by only holding the lock to transfer/move
accept_thread_ out of the member, then release the lock and call join on the
moved local thread. Concretely, in Server::wait() acquire the mutex, std::move
accept_thread_ into a local std::thread (or swap), let the lock go out of scope,
then if the local thread.joinable() call join(); this uses the existing
accept_thread_ and thread_mutex_ symbols and avoids joining while holding the
mutex.
---
Nitpick comments:
In `@include/storage/page.hpp`:
- Line 24: The Page() constructor redundantly calls reset_memory() even though
the member array data_ is value-initialized with {}; remove the extra
initialization by deleting the reset_memory() call from the Page() constructor
(leave data_ declared with {}), or alternatively remove the {} and keep
reset_memory()—choose one consistent approach; update the Page() constructor
(symbol: Page()) and the member declaration (symbol: data_) so initialization
happens only once.
- Line 41: The accessor get_file_name() currently returns std::string by value
causing allocations; change its signature to return a const std::string& (e.g.,
[[nodiscard]] const std::string& get_file_name() const) so callers receive a
reference to the member file_name_ without copying, and keep the function const
and nodiscard attributes; ensure file_name_ remains a std::string data member so
the returned reference is valid for the object's lifetime.
In `@tests/cloudSQL_tests.cpp`:
- Around line 361-444: The two disabled tests enclosed by the `#if` 0/#endif block
(NetworkTest_Handshake and NetworkTest_MultiClient) are dead code and should be
removed; delete the entire `#if` 0 ... `#endif` block that contains these tests, and
if their active equivalents were migrated (e.g., to server tests), ensure there
are no duplicate test definitions by verifying NetworkTest_Handshake and
NetworkTest_MultiClient exist only in the intended test file and not left behind
as commented-out code; remove the `#if` 0/#endif markers and the enclosed test
functions to clean up the codebase.
ℹ️ Review info
Configuration used: defaults
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (5)
include/storage/page.hppsrc/network/server.cpptests/cloudSQL_tests.cpptests/server_tests.cpptests/transaction_manager_tests.cpp
| // Get Page LSN (for recovery/WAL) | ||
| // Assuming page layout reserves first 8 bytes (or 4 bytes) for PageLSN depending on implementation | ||
| // We will store LSN explicitly here to avoid parsing the header if not strictly needed, | ||
| // but typically it's written in the first 4 bytes of data_. | ||
| [[nodiscard]] int32_t get_lsn() const { return lsn_; } | ||
| void set_lsn(int32_t lsn) { lsn_ = lsn; } |
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BufferPoolManager must serialize page LSN to persist it with page data.
The Page class stores lsn_ as a separate member, not as part of data_. Your comment correctly notes that LSNs are "typically written in the first 4 bytes of data_," but this implementation keeps them separate. When BufferPoolManager flushes dirty pages to disk, it will write only the data_ buffer—the lsn_ value will remain in memory and be lost on crash. Recovery will lack page LSNs needed to check durability of modifications.
Ensure BufferPoolManager.flush_page() serializes the current lsn_ value into data_ before calling StorageManager.write_page(), and deserializes it back on read, or document why a different recovery strategy is used.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@include/storage/page.hpp` around lines 49 - 54, The Page currently keeps LSN
in lsn_ separate from data_, so update the flush/read paths to persist the LSN:
before BufferPoolManager::flush_page() calls StorageManager::write_page(),
serialize get_lsn() into the agreed bytes at the start of the Page::data_ buffer
(e.g., first 4 bytes) so the on-disk page contains the LSN, and likewise when
pages are read back from StorageManager::read_page() deserialize those bytes
into Page::set_lsn(); modify BufferPoolManager::flush_page() and the page load
path to perform this packing/unpacking, ensuring get_lsn()/set_lsn() remain
authoritative and consistent with data_ prior to any disk I/O.
- Fixed corrupted CMakeLists.txt with proper formatting and structure. - Refactored test macros in test_utils.hpp to use type-safe inline functions. - Eliminated cppcoreguidelines-avoid-do-while warnings in tests.
- Added LRUReplacer to manage page eviction policies. - Adheres to project standards with clean abstractions and no-warning build.
- Added BufferPoolManager to manage in-memory caching of disk pages. - Integrated with LRUReplacer for efficient page eviction. - Resolved type mismatches between storage manager and transaction manager.
- Implemented RecoveryManager stubs for Analysis, Redo, and Undo phases. - Adhered to the Rule of Five for resource management. - Resolved static-member warnings by adding temporary stub usage.
- Updated LogRecord to support various operation types (Insert, Delete, Update). - Ensured consistency with the WAL format.
…integration - Updated Transaction and TransactionManager headers to use BufferPoolManager. - Enhanced snapshot logic for better MVCC isolation.
- Refactored Page, HeapTable, and BTreeIndex headers to support BufferPoolManager. - Improved abstraction for disk-backed data structures.
- Updated HeapTable and BTreeIndex to use BufferPoolManager for page access. - Refactored StorageManager to handle low-level I/O through BufferPoolManager. - Resolved various linting warnings related to pointer arithmetic and type safety.
1 participant
This PR addresses several technical debt items and stability issues:
Summary by CodeRabbit
New Features
Bug Fixes
Tests