Enable PYARROW_BUILD_DATASET

ci/scripts/python_build.sh

@@ -32,6 +32,7 @@ export PYARROW_WITH_FLIGHT=${ARROW_FLIGHT:-OFF}
 export PYARROW_WITH_PLASMA=${ARROW_PLASMA:-OFF}
 export PYARROW_WITH_GANDIVA=${ARROW_GANDIVA:-OFF}
 export PYARROW_WITH_PARQUET=${ARROW_PARQUET:-OFF}
+export PYARROW_WITH_DATASET=${ARROW_DATASET:-OFF}
 
 export LD_LIBRARY_PATH=${ARROW_HOME}/lib:${LD_LIBRARY_PATH}
 

python/pyarrow/tests/test_dataset.py

@@ -23,7 +23,6 @@ import pyarrow.fs as fs
 try:
     import pyarrow.dataset as ds
 except ImportError:
-    raise
     ds = None
 
 # Marks all of the tests in this module