feat: Complete Phase 3.1 Lance real data writing with build system fixes

.cargo/config.toml

@@ -0,0 +1,3 @@
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"
+rustflags = ["-C", "link-arg=-fuse-ld=mold"]

.gitignore

@@ -25,14 +25,20 @@ libtpch_core.a
 *.lib
 *.obj
 
+# CMake build artifacts in any subdirectory
+**/CMakeFiles/
+**/cmake_install.cmake
+**/CTestTestfile.cmake
+
 # Build artifacts in examples/ subdirectory (CMake output)
-examples/CMakeFiles/
 examples/Makefile
-examples/cmake_install.cmake
 examples/*.o
 examples/*.o.d
 examples/*.d
 
+# Build artifacts in third_party subdirectories
+third_party/dbgen/Makefile
+
 # Executables (generated from examples and main)
 /tpch_benchmark
 /examples/simple_arrow_parquet
@@ -62,3 +68,15 @@ __pycache__/
 # Package manager artifacts (should not be committed)
 *.deb
 *.rpm
+
+# Root-level documentation and text files (except README.md)
+/*.md
+!README.md
+/*.txt
+
+# Rust build artifacts
+# Note: Cargo target directory should be in CMAKE_BINARY_DIR (e.g., build/rust/)
+# NOT in the source tree. Ignore any in-source target/ directories.
+third_party/lance-ffi/target/
+# Note: Project-specific Cargo.lock files (e.g., third_party/lance-ffi/Cargo.lock) ARE committed
+# Only a root-level Cargo.lock would be ignored (if it existed)

.gitmodules

@@ -10,3 +10,9 @@
 [submodule "third_party/arrow"]
 	path = third_party/arrow
 	url = https://github.com/apache/arrow.git
+[submodule "third_party/googletest"]
+	path = third_party/googletest
+	url = https://github.com/google/googletest.git
+[submodule "third_party/lance"]
+	path = third_party/lance
+	url = https://github.com/lancedb/lance