From ce6e01b9884ac178a1120b3b42dfdf2b96419b8c Mon Sep 17 00:00:00 2001
From: Philipp Moritz <pcmoritz@gmail.com>
Date: Mon, 12 Nov 2018 18:49:09 -0800
Subject: [PATCH] enable incremental builds (#3292)

---
 build.sh                                 | 1 +
 cmake/Modules/ArrowExternalProject.cmake | 1 +
 2 files changed, 2 insertions(+)

diff --git a/build.sh b/build.sh
index b84763733..6aa695b83 100755
--- a/build.sh
+++ b/build.sh
@@ -104,6 +104,7 @@ pushd "$BUILD_DIR"
 # avoid the command failed and exits
 # and cmake will check some directories to determine whether some targets built
 make clean || true
+rm -rf external/arrow-install
 
 cmake -DCMAKE_BUILD_TYPE=$CBUILD_TYPE \
       -DCMAKE_RAY_LANG_JAVA=$RAY_BUILD_JAVA \
diff --git a/cmake/Modules/ArrowExternalProject.cmake b/cmake/Modules/ArrowExternalProject.cmake
index b57104f1f..572e12b27 100644
--- a/cmake/Modules/ArrowExternalProject.cmake
+++ b/cmake/Modules/ArrowExternalProject.cmake
@@ -92,6 +92,7 @@ ExternalProject_Add(arrow_ep
   DEPENDS flatbuffers boost glog
   GIT_REPOSITORY ${arrow_URL}
   GIT_TAG ${arrow_TAG}
+  UPDATE_COMMAND ""
   ${ARROW_CONFIGURE}
   BUILD_BYPRODUCTS "${ARROW_SHARED_LIB}" "${ARROW_STATIC_LIB}")