Expose cpp lib and support iterative interface for arrow destination

.gitignore

@@ -17,3 +17,4 @@ dist
 benchmark.json
 docs/_build
 connectorx/examples/test.rs
+*.duckdb

Cargo.toml

@@ -1,6 +1,6 @@
 [workspace]
 default-members = ["connectorx"]
-members = ["connectorx"]
+members = ["connectorx", "connectorx-cpp"]
 
 [profile.release]
 debug = true

Justfile

@@ -1,10 +1,16 @@
 set dotenv-load := true
 
 build-release:
-    cargo build  --release
+    cargo build --release --features all
 
 build-debug:
-    cargo build
+    cargo build --features all
+
+build-cpp:
+    cd connectorx-cpp && cargo build
+
+build-cpp-release:
+    cd connectorx-cpp && cargo build --release
 
 test +ARGS="": 
     cargo test --features all {{ARGS}} -- --nocapture

connectorx-cpp/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "connectorx-cpp"
+version = "0.3.1"
+edition = "2021"
+license = "MIT"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc = "0.2"
+connectorx = {path = "../connectorx", default-features = false}
+arrow = {version = "22", features = ["prettyprint", "ffi"]}
+
+[lib]
+crate-type = ["cdylib"]
+name = "connectorx_cpp"
+
+[features]
+default = ["fptr", "nbstr", "dsts", "srcs", "federation"]
+dsts = ["connectorx/dst_arrow", "connectorx/dst_arrow2"]
+fptr = ["connectorx/fptr"]
+branch = ["connectorx/branch"]
+federation = ["connectorx/federation"]
+nbstr = []
+srcs = [
+  "connectorx/src_postgres",
+  "connectorx/src_mysql",
+  "connectorx/src_sqlite",
+  "connectorx/src_mssql",
+  "connectorx/src_oracle",
+  "connectorx/src_bigquery",
+]