From d7b1aa8b90eb75956d717b8258cdb9367dde0848 Mon Sep 17 00:00:00 2001
From: naman1996 <namanudasi160196@gmail.com–>
Date: Wed, 21 Oct 2020 16:08:44 +0530
Subject: [PATCH 1/2] Add llvm@9 during brew install for macOS

---
 cpp/CMakeLists.txt                    | 2 +-
 dev/tasks/gandiva-jars/travis.osx.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 0720f567a4e..5b200c32e60 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -109,7 +109,7 @@ set(BUILD_SUPPORT_DIR "${CMAKE_SOURCE_DIR}/build-support")
 set(ARROW_CMAKE_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
 set(ARROW_DOC_DIR "share/doc/${PROJECT_NAME}")
 
-set(ARROW_LLVM_VERSIONS "10" "9" "8" "7")
+set(ARROW_LLVM_VERSIONS "9" "8" "7")
 list(GET ARROW_LLVM_VERSIONS 0 ARROW_LLVM_VERSION_PRIMARY)
 string(REGEX
        REPLACE "^([0-9]+)(\\..+)?" "\\1" ARROW_LLVM_VERSION_PRIMARY_MAJOR
diff --git a/dev/tasks/gandiva-jars/travis.osx.yml b/dev/tasks/gandiva-jars/travis.osx.yml
index 8a0576dcd62..7592a585efc 100644
--- a/dev/tasks/gandiva-jars/travis.osx.yml
+++ b/dev/tasks/gandiva-jars/travis.osx.yml
@@ -40,7 +40,7 @@ before_script:
   - export TRAVIS_BUILD_DIR=$TRAVIS_BUILD_DIR/arrow
   - git -C arrow submodule update --init --recursive
   - brew update
-  - brew install bison flex llvm
+  - brew install bison flex llvm@9
   - brew tap adoptopenjdk/openjdk
   - brew cask install adoptopenjdk8
   - export JAVA_HOME=/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home

From c217cd102e3282b33a2444e2f24523d6153a4ac8 Mon Sep 17 00:00:00 2001
From: naman1996 <namanudasi160196@gmail.com–>
Date: Wed, 21 Oct 2020 20:30:34 +0530
Subject: [PATCH 2/2] Adding llvm@9 to brewfile

---
 cpp/Brewfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/Brewfile b/cpp/Brewfile
index 7de6c7deabe..b63bc882e15 100644
--- a/cpp/Brewfile
+++ b/cpp/Brewfile
@@ -25,7 +25,7 @@ brew "flatbuffers"
 brew "git"
 brew "glog"
 brew "grpc"
-brew "llvm"
+brew "llvm@9"
 brew "llvm@8"
 brew "lz4"
 brew "minio"