ARROW-7752: [Release] Enable and test dataset in the verification script

We're not testing the dataset feature in the verifications scripts yet.

Closes #6346 from kszucs/dataset-verification and squashes the following commits:

b8530ea <Krisztián Szűcs> Test dataset during the verification

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

dev/release/verify-release-candidate-wheels.bat

@@ -75,6 +75,7 @@ python -c "import pyarrow" || EXIT /B 1
 python -c "import pyarrow.flight" || EXIT /B 1
 python -c "import pyarrow.gandiva" || EXIT /B 1
 python -c "import pyarrow.parquet" || EXIT /B 1
+python -c "import pyarrow.dataset" || EXIT /B 1
 
 call deactivate
 

dev/release/verify-release-candidate.bat

@@ -90,6 +90,7 @@ cmake -G "%GENERATOR%" ^
       -DARROW_WITH_BROTLI=ON ^
       -DARROW_FLIGHT=ON ^
       -DARROW_PYTHON=ON ^
+      -DARROW_DATASET=ON ^
       -DARROW_PARQUET=ON ^
       ..  || exit /B
 
@@ -120,6 +121,7 @@ pushd %ARROW_SOURCE%\python
 set PYARROW_CMAKE_GENERATOR=%GENERATOR%
 set PYARROW_WITH_FLIGHT=1
 set PYARROW_WITH_PARQUET=1
+set PYARROW_WITH_DATASET=1
 python setup.py build_ext --inplace --bundle-arrow-cpp bdist_wheel  || exit /B
 py.test pyarrow -v -s --parquet || exit /B
 

dev/release/verify-release-candidate.sh

@@ -276,6 +276,7 @@ ${ARROW_CMAKE_OPTIONS:-}
 -DARROW_PYTHON=ON
 -DARROW_GANDIVA=ON
 -DARROW_PARQUET=ON
+-DARROW_DATASET=ON
 -DPARQUET_REQUIRE_ENCRYPTION=ON
 -DARROW_WITH_BZ2=ON
 -DARROW_WITH_ZLIB=ON
@@ -365,6 +366,7 @@ test_python() {
 
   pip install -r requirements.txt -r requirements-test.txt
 
+  export PYARROW_WITH_DATASET=1
   export PYARROW_WITH_GANDIVA=1
   export PYARROW_WITH_PARQUET=1
   export PYARROW_WITH_PLASMA=1
@@ -605,7 +607,8 @@ check_python_imports() {
   python -c "import pyarrow.fs"
 
   if [[ "$py_arch" =~ ^3 ]]; then
-    # Flight and Gandiva are only available for py3
+    # Flight, Gandiva and Dataset are only available for py3
+    python -c "import pyarrow.dataset"
     python -c "import pyarrow.flight"
     python -c "import pyarrow.gandiva"
   fi