don't build gandiva in mac os build

Author: pcmoritz

.travis.yml

@@ -78,6 +78,7 @@ matrix:
     - ARROW_BUILD_WARNING_LEVEL=CHECKIN
     - ARROW_TRAVIS_PYTHON_JVM=1
     - ARROW_TRAVIS_JAVA_BUILD_ONLY=1
+    - ARROW_TRAVIS_PYTHON_GANDIVA=1
     # ARROW-2999 Benchmarks are disabled in Travis CI for the time being
     # - ARROW_TRAVIS_PYTHON_BENCHMARKS=1
     - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"

ci/travis_script_python.sh

@@ -96,6 +96,10 @@ if [ $ARROW_TRAVIS_COVERAGE == "1" ]; then
   CMAKE_COMMON_FLAGS="$CMAKE_COMMON_FLAGS -DARROW_GENERATE_COVERAGE=ON"
 fi
 
+if [ $ARROW_TRAVIS_PYTHON_GANDIVA == "1" ]; then
+  CMAKE_COMMON_FLAGS="$CMAKE_COMMON_FLAGS -DARROW_GANDIVA=ON -DARROW_GANDIVA_BUILD_TESTS=OFF"
+fi
+
 cmake -GNinja \
       $CMAKE_COMMON_FLAGS \
       -DARROW_BUILD_TESTS=on \
@@ -105,8 +109,6 @@ cmake -GNinja \
       -DARROW_TENSORFLOW=on \
       -DARROW_PYTHON=on \
       -DARROW_ORC=on \
-      -DARROW_GANDIVA=on \
-      -DARROW_GANDIVA_BUILD_TESTS=off \
       -DCMAKE_BUILD_TYPE=$ARROW_BUILD_TYPE \
       -DCMAKE_INSTALL_PREFIX=$ARROW_HOME \
       $ARROW_CPP_DIR