Merge pull request 'init' (#2) from init into main

Reviewed-on: #2

CMakeLists.txt

@@ -12,14 +12,51 @@ set(CMAKE_CXX_EXTENSIONS        OFF)   # -std=c++20 statt -std=gnu++20
 # ---------------------------------------------------------------------------
 # Conan-generierte Pakete einbinden (CMakeDeps-Finder liegen im build-Ordner)
 # ---------------------------------------------------------------------------
-# find_package(fmt      REQUIRED)   # Beispiel - einkommentieren wenn dep da ist
-# find_package(spdlog   REQUIRED)   # Beispiel
+# find_package(fmt      REQUIRED)   # einkommentieren wenn dep da ist
+# find_package(spdlog   REQUIRED)
+
+# ---------------------------------------------------------------------------
+# Schicht 1 - Storage Engine (C)
+# Hinweis: neue .c-Dateien hier manuell eintragen (kein GLOB)
+# ---------------------------------------------------------------------------
+set(STORAGE_SOURCES
+    src/storage/page.c
+    src/storage/heap.c
+    src/storage/btree.c
+    src/storage/buffer_pool.c
+    src/storage/free_space_map.c
+    src/storage/arena.c
+    src/storage/wal.c
+)
+
+# ---------------------------------------------------------------------------
+# Schicht 2 - Engine Logic (C++)
+# ---------------------------------------------------------------------------
+set(ENGINE_SOURCES
+    src/engine/query_router.cpp
+    src/engine/delta_merge.cpp
+    src/engine/mvcc.cpp
+    src/engine/executor.cpp
+)
+
+# ---------------------------------------------------------------------------
+# Schicht 3 - SQL Frontend (C++)
+# ---------------------------------------------------------------------------
+set(SQL_SOURCES
+    src/sql/tokenizer.cpp
+    src/sql/parser.cpp
+    src/sql/ast.cpp
+    src/sql/planner.cpp
+)
 
 # ---------------------------------------------------------------------------
 # Hauptprogramm
 # ---------------------------------------------------------------------------
 add_executable(pauldb
     src/main.cpp
+    ${STORAGE_SOURCES}
+    ${ENGINE_SOURCES}
+    ${SQL_SOURCES}
 )
 
 target_include_directories(pauldb
@@ -31,6 +68,12 @@ target_include_directories(pauldb
 # target_link_libraries(pauldb PRIVATE fmt::fmt spdlog::spdlog)
 
 # ---------------------------------------------------------------------------
-# Installationsregeln (für package() in conanfile.py)
+# Tests (CTest)
+# ---------------------------------------------------------------------------
+enable_testing()
+# add_subdirectory(test)   # einkommentieren sobald erste Tests da sind
+
+# ---------------------------------------------------------------------------
+# Installationsregeln (fur package() in conanfile.py)
 # ---------------------------------------------------------------------------
 install(TARGETS pauldb DESTINATION bin)

docs/adr/ADR-001-htap-delta-merge.md

@@ -0,0 +1,17 @@
+# ADR-001: HTAP via Delta-Merge (HANA-inspired)
+
+**Status:** Accepted
+
+## Decision
+PaulDB implements HTAP through a Delta (Row-Store) + Main (Column-Store) split,
+merged periodically - mirroring SAP HANA's architecture.
+
+## Rationale
+Single-store systems force a choice between OLTP and OLAP performance.
+The Delta-Merge pattern allows both: fast writes land in Delta (row-optimized),
+analytics scan Main (column-optimized, compressed).
+
+## Consequences
+- Every query must union Delta + Main results.
+- A merge worker must run periodically.
+- The C ABI boundary (storage.h) cleanly separates both stores.

src/engine/delta_merge.cpp

@@ -0,0 +1 @@
+/* delta_merge.cpp - Engine Logic (C++) */

src/engine/executor.cpp

@@ -0,0 +1 @@
+/* executor.cpp - Engine Logic (C++) */

src/engine/mvcc.cpp

@@ -0,0 +1 @@
+/* mvcc.cpp - Engine Logic (C++) */

src/engine/query_router.cpp

@@ -0,0 +1 @@
+/* query_router.cpp - Engine Logic (C++) */

src/main.cpp

@@ -0,0 +1,6 @@
+#include <cstdio>
+
+int main() {
+    std::printf("PaulDB starting...\n");
+    return 0;
+}

src/sql/ast.cpp

@@ -0,0 +1 @@
+/* ast.cpp - SQL Frontend (C++) */

src/sql/parser.cpp

@@ -0,0 +1 @@
+/* parser.cpp - SQL Frontend (C++) */

src/sql/planner.cpp

@@ -0,0 +1 @@
+/* planner.cpp - SQL Frontend (C++) */

src/sql/tokenizer.cpp

@@ -0,0 +1 @@
+/* tokenizer.cpp - SQL Frontend (C++) */

src/storage/arena.c

@@ -0,0 +1,2 @@
+/* arena.c - Storage Engine (C) */
+#include "pauldb/storage.h"

src/storage/btree.c

@@ -0,0 +1,2 @@
+/* btree.c - Storage Engine (C) */
+#include "pauldb/storage.h"

src/storage/buffer_pool.c

@@ -0,0 +1,2 @@
+/* buffer_pool.c - Storage Engine (C) */
+#include "pauldb/storage.h"

src/storage/free_space_map.c

@@ -0,0 +1,2 @@
+/* free_space_map.c - Storage Engine (C) */
+#include "pauldb/storage.h"

src/storage/heap.c

@@ -0,0 +1,2 @@
+/* heap.c - Storage Engine (C) */
+#include "pauldb/storage.h"

src/storage/page.c

@@ -0,0 +1,2 @@
+/* page.c - Storage Engine (C) */
+#include "pauldb/storage.h"

src/storage/wal.c

@@ -0,0 +1,2 @@
+/* wal.c - Storage Engine (C) */
+#include "pauldb/storage.h"