Add visitor for converting kernel expressions to engine expressions

.github/workflows/build.yml

@@ -108,16 +108,24 @@ jobs:
           cargo build
           popd
           pushd ffi
-          cargo b --features default-engine,sync-engine
+          cargo b --features default-engine,sync-engine,test-ffi
           popd
-      - name: build and run test
+      - name: build and run read-table test
         run: |
           pushd ffi/examples/read-table
           mkdir build
           pushd build
           cmake ..
           make
           make test
+      - name: build and run visit-expression test
+        run: |
+          pushd ffi/examples/visit-expression
+          mkdir build
+          pushd build
+          cmake ..
+          make
+          make test
 
   coverage:
     runs-on: ubuntu-latest

ffi/Cargo.toml

@@ -47,3 +47,4 @@ default-engine = [
 ]
 sync-engine = ["delta_kernel/sync-engine"]
 developer-visibility = []
+test-ffi = []

ffi/examples/visit-expression/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.12)
+project(visit_expressions)
+
+add_executable(visit_expression visit_expression.c)
+target_compile_definitions(visit_expression PUBLIC DEFINE_DEFAULT_ENGINE)
+target_include_directories(visit_expression PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../../../target/ffi-headers")
+target_link_directories(visit_expression PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../../../target/debug")
+target_link_libraries(visit_expression PUBLIC delta_kernel_ffi)
+target_compile_options(visit_expression PUBLIC)
+
+if(MSVC)
+  target_compile_options(visit_expression PRIVATE /W4 /WX)
+else()
+  target_compile_options(visit_expression PRIVATE -Wall -Wextra -Wpedantic -Werror -Wno-strict-prototypes)
+endif()
+
+# Add the kernel expresion -> engine expression test
+include(CTest)
+set(ExprTestRunner "../../../tests/test_expression_visitor/run_test.sh")
+set(ExprExpectedPath "../../../tests/test_expression_visitor/expected.txt")
+add_test(NAME test_expression_visitor COMMAND ${ExprTestRunner} ${ExprExpectedPath})