chore: remove legacy C plugin integration (#3243)

The plugin hasn't built in over a year and the fact that we have git submodules can cause expensive build times for downstream projects like lancedb when they need to declare a git dependency on lance. If we need it back later we can always revert the change.
lancedb · Dec 14, 2024 · 6203435 · 6203435
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diff --git a/.github/workflows/duckdb.yml b/.github/workflows/duckdb.yml
diff --git a/.gitignore b/.gitignore
@@ -67,11 +67,6 @@ docs/api/python
 **/.ipynb_checkpoints/
 docs/notebooks
 
-
-integration/duckdb/*-build
-integration/duckdb/lance.duckdb_extension.*.zip
-
-notebooks/lance.duckdb_extension
 notebooks/sift
 notebooks/image_data/data
 benchmarks/sift/sift

diff --git a/.gitmodules b/.gitmodules
@@ -1,6 +0,0 @@
-[submodule "integration/duckdb_lance/duckdb"]
-	path = integration/duckdb_lance/duckdb
-	url = https://github.com/duckdb/duckdb.git
-[submodule "integration/duckdb_lance/duckdb-ext/duckdb"]
-	path = integration/duckdb_lance/duckdb-ext/duckdb
-	url = https://github.com/duckdb/duckdb.git

diff --git a/docs/contributing.rst b/docs/contributing.rst
@@ -127,13 +127,6 @@ Example Notebooks
 
 Example notebooks are under `examples`. These are standalone notebooks you should be able to download and run.
 
-DuckDB Extension
-~~~~~~~~~~~~~~~~
-
-In python, Lance integrates with DuckDB via Apache Arrow. Outside of python, the highly experimental duckdb extension for Lance
-lives under `integration/duckdb_lance`. This uses the DuckDB `Rust extension framework <https://github.com/Mause/duckdb-extension-framework>`_.
-The main code lives under `integration/duckdb_lance/src`. Follow the integration README for more details.
-
 Benchmarks
 ~~~~~~~~~~
 

diff --git a/integration/duckdb_lance/CMakeLists.txt b/integration/duckdb_lance/CMakeLists.txt
diff --git a/integration/duckdb_lance/Cargo.toml b/integration/duckdb_lance/Cargo.toml
diff --git a/integration/duckdb_lance/Makefile b/integration/duckdb_lance/Makefile
diff --git a/integration/duckdb_lance/README.md b/integration/duckdb_lance/README.md
diff --git a/integration/duckdb_lance/duckdb b/integration/duckdb_lance/duckdb
diff --git a/integration/duckdb_lance/duckdb-ext/Cargo.toml b/integration/duckdb_lance/duckdb-ext/Cargo.toml
diff --git a/integration/duckdb_lance/duckdb-ext/README.md b/integration/duckdb_lance/duckdb-ext/README.md
diff --git a/integration/duckdb_lance/duckdb-ext/build.rs b/integration/duckdb_lance/duckdb-ext/build.rs
diff --git a/integration/duckdb_lance/duckdb-ext/duckdb b/integration/duckdb_lance/duckdb-ext/duckdb
diff --git a/integration/duckdb_lance/duckdb-ext/src/connection.rs b/integration/duckdb_lance/duckdb-ext/src/connection.rs