GH-47225: [C++] Remove Skyhook (#47262)

### Rationale for this change
We decided to move Skyhook to its own repository here: https://lists.apache.org/thread/f5ndxf0o6v4wbzgoy6nsrj4xkn34f380

We've created https://github.com/apache/arrow-skyhook and extract Skyhook related commits to the repository.

### What changes are included in this PR?

Remove Skyhook from the main repository

### Are these changes tested?

CI is validated.

### Are there any user-facing changes?

Yes, Skyhook is removed from the main repository.

* GitHub Issue: #47225

Authored-by: Raúl Cumplido <[email protected]>
Signed-off-by: Sutou Kouhei <[email protected]>

Author: raulcd

ci/scripts/cpp_build.sh

@@ -221,7 +221,6 @@ else
     -DARROW_RUNTIME_SIMD_LEVEL=${ARROW_RUNTIME_SIMD_LEVEL:-MAX} \
     -DARROW_S3=${ARROW_S3:-OFF} \
     -DARROW_SIMD_LEVEL=${ARROW_SIMD_LEVEL:-DEFAULT} \
-    -DARROW_SKYHOOK=${ARROW_SKYHOOK:-OFF} \
     -DARROW_SUBSTRAIT=${ARROW_SUBSTRAIT:-OFF} \
     -DARROW_TEST_LINKAGE=${ARROW_TEST_LINKAGE:-shared} \
     -DARROW_TEST_MEMCHECK=${ARROW_TEST_MEMCHECK:-OFF} \

ci/scripts/generate_dataset.py

@@ -706,10 +706,6 @@ if(ARROW_GANDIVA)
   add_subdirectory(src/gandiva)
 endif()
 
-if(ARROW_SKYHOOK)
-  add_subdirectory(src/skyhook)
-endif()
-
 if(ARROW_BUILD_EXAMPLES)
   add_custom_target(runexample ctest -L example)
   add_subdirectory(examples/arrow)

ci/scripts/integration_skyhook.sh

@@ -179,7 +179,6 @@
         "ARROW_BUILD_EXAMPLES": "ON",
         "ARROW_BUILD_UTILITIES": "ON",
         "ARROW_FLIGHT_SQL_ODBC": "ON",
-        "ARROW_SKYHOOK": "ON",
         "ARROW_TENSORFLOW": "ON",
         "PARQUET_BUILD_EXAMPLES": "ON",
         "PARQUET_BUILD_EXECUTABLES": "ON"

cpp/CMakeLists.txt

@@ -34,7 +34,3 @@ FILES=($(find $FORMAT_DIR -name '*.fbs'))
 FILES+=("$SOURCE_DIR/arrow/ipc/feather.fbs")
 
 $FLATC -o "$OUT_DIR" "${FILES[@]}"
-
-# Skyhook flatbuffers
-$FLATC -o "$SOURCE_DIR/skyhook/protocol" \
-  "$SOURCE_DIR/skyhook/protocol/ScanRequest.fbs"

cpp/CMakePresets.json

@@ -407,15 +407,6 @@ takes precedence over ccache if a storage backend is configured" ON)
                 DEPENDS
                 ARROW_S3)
 
-  define_option(ARROW_SKYHOOK
-                "Build the Skyhook libraries"
-                OFF
-                DEPENDS
-                ARROW_DATASET
-                ARROW_PARQUET
-                ARROW_WITH_LZ4
-                ARROW_WITH_SNAPPY)
-
   define_option(ARROW_SUBSTRAIT
                 "Build the Arrow Substrait Consumer Module"
                 OFF

cpp/build-support/update-flatbuffers.sh

@@ -188,19 +188,6 @@ if(ARROW_PARQUET AND ARROW_DATASET)
   endif()
 
   add_arrow_example(udf_example)
-
-  if(ARROW_SKYHOOK)
-    if(ARROW_BUILD_SHARED)
-      list(APPEND DATASET_EXAMPLES_LINK_LIBS arrow_skyhook_shared)
-    else()
-      list(APPEND DATASET_EXAMPLES_LINK_LIBS arrow_skyhook_static)
-    endif()
-
-    add_arrow_example(dataset_skyhook_scan_example EXTRA_LINK_LIBS
-                      ${DATASET_EXAMPLES_LINK_LIBS})
-    add_dependencies(dataset-skyhook-scan-example parquet)
-  endif()
-
 endif()
 
 if(ARROW_GANDIVA)